diff --git a/survey_record_generation/__manifest__.py b/survey_record_generation/__manifest__.py
index 04c6cd0..32bee37 100644
--- a/survey_record_generation/__manifest__.py
+++ b/survey_record_generation/__manifest__.py
@@ -11,7 +11,7 @@ Allow to create record of any model when sending the form :
 * Associate question with fields
 * For x2m fields : Associate values to questions
 """, 
-    "version": "16.0.1.0.2",
+    "version": "16.0.1.0.3",
     "license": "AGPL-3",
     "author": "Elabore",
     "website": "https://www.elabore.coop",
diff --git a/survey_record_generation/migrations/16.0.1.0.3/end-migration.py b/survey_record_generation/migrations/16.0.1.0.3/end-migration.py
new file mode 100644
index 0000000..332860c
--- /dev/null
+++ b/survey_record_generation/migrations/16.0.1.0.3/end-migration.py
@@ -0,0 +1,159 @@
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+"""Relink survey.user_input.partner_id/email to the contact that actually
+matches each participant's own answers.
+
+Before this version, survey.user_input.partner_id/email were only updated
+when _mark_done() created a *new* res.partner. If the answer already had a
+partner_id/email (e.g. inherited from the Odoo user who was logged in when
+the /survey/start link was opened, or from some other unidentified cause),
+_mark_done() silently kept that value even when the survey_record_creation
+config found or created a different, correct contact from the participant's
+own answers. This backfill re-runs that resolution for every already-done
+answer and fixes partner_id/email accordingly.
+
+It never re-triggers the other survey.user_input._mark_done() overrides
+(crm lead / event registration / notification modules, ...): it only calls
+the res.partner-matching helpers directly, so it can't create duplicate
+leads, registrations, etc. for historical submissions.
+
+A res.partner is expected to already exist for every done submission (it
+was necessarily found or created the first time _mark_done() ran), so this
+backfill never creates one. It first looks for the survey.generated.record
+row _mark_done() logged when it created that partner, and falls back to
+re-deriving the match through find_existing_record()/
+find_duplicate_if_there_are_fields_with_unicity_check() when there is no
+such row (existing partner matched instead of created) or it points to a
+partner that has since been deleted (e.g. merged into another contact). If
+neither approach finds anything, the record is left untouched and logged
+for manual review instead.
+"""
+import logging
+
+from odoo import SUPERUSER_ID, api
+
+_logger = logging.getLogger(__name__)
+
+
+def migrate(cr, version):
+    env = api.Environment(cr, SUPERUSER_ID, {})
+    user_input_model = env["survey.user_input"]
+
+    surveys_with_partner_creation = env["survey.record.creation"].search(
+        [("model_id.model", "=", "res.partner")]
+    ).survey_id
+
+    user_inputs = user_input_model.search(
+        [
+            ("survey_id", "in", surveys_with_partner_creation.ids),
+            ("state", "=", "done"),
+        ]
+    )
+
+    _logger.info(
+        "survey_record_generation: relinking partner_id/email on %d done "
+        "survey.user_input records",
+        len(user_inputs),
+    )
+
+    fixed_count = 0
+    not_found_count = 0
+
+    for user_input in user_inputs:
+        record_creations = user_input.survey_id.survey_record_creation_ids.filtered(
+            lambda rc: rc.model_id.model == "res.partner"
+        ).sorted("sequence")
+
+        record_creation = record_creations[:1]
+        if not record_creation:
+            continue
+
+        # 1) Prefer the res.partner this very submission created, if any
+        # (the first one, by id, in the rare case there is more than one):
+        # it's the exact record _mark_done() produced for this answer, no
+        # guessing involved. This is also the only option for surveys whose
+        # record creation has neither update_existing_records nor any
+        # unicity_check field configured, since find_existing_record()/
+        # find_duplicate...() can then never find anything (nothing to
+        # search on).
+        record = False
+        for generated in user_input.generated_record_ids.sorted("id"):
+            if (
+                generated.survey_record_creation_id == record_creation
+                and generated.created_record_id
+                and generated.created_record_id._name == "res.partner"
+                and generated.created_record_id.exists()
+            ):
+                # The referenced partner may have since been deleted (e.g.
+                # merged into another contact): in that case it's not usable
+                # and we fall through to the search-based lookup below.
+                record = generated.created_record_id
+                break
+
+        # 2) Otherwise, this submission matched an already-existing partner
+        # instead of creating one (find_existing_record()/find_duplicate...()
+        # branch of _mark_done()): re-derive it the same way.
+        if not record:
+            # Only compute the fields find_existing_record()/find_duplicate...()
+            # actually read (the search field, and any unicity_check field),
+            # not every field of the record creation: other fields (e.g. a
+            # "record" reference to a model defined in a module that depends
+            # on this one) may not be loadable yet at this point of the
+            # upgrade, and are useless here anyway since this backfill never
+            # writes to res.partner.
+            needed_field_names = set()
+            if (
+                record_creation.update_existing_records
+                and record_creation.field_to_retrieve_existing_records
+            ):
+                needed_field_names.add(
+                    record_creation.field_to_retrieve_existing_records.name
+                )
+            unicity_field_values = record_creation.field_values_ids.filtered(
+                lambda field_value: field_value.unicity_check
+            )
+            needed_field_names.update(unicity_field_values.mapped("field_id.name"))
+
+            vals = {}
+            for field_value in record_creation.field_values_ids:
+                if field_value.field_id.name not in needed_field_names:
+                    continue
+                value, __ = user_input_model.get_value_based_on_value_origin(
+                    field_value=field_value,
+                    user_input=user_input,
+                    created_records={},
+                    model="res.partner",
+                    other_record_fields_to_update=[],
+                )
+                vals[field_value.field_id.name] = value
+
+            existing_record = user_input_model.find_existing_record(
+                record_creation, vals
+            )
+            duplicate = (
+                user_input_model.find_duplicate_if_there_are_fields_with_unicity_check(
+                    "res.partner", record_creation, vals
+                )
+            )
+            record = duplicate or existing_record
+
+        if not record:
+            _logger.warning(
+                "survey_record_generation: no existing res.partner found for "
+                "survey.user_input %s while backfilling partner_id/email, "
+                "leaving it untouched",
+                user_input.id,
+            )
+            not_found_count += 1
+            continue
+
+        if user_input.partner_id != record or user_input.email != record.email:
+            user_input.partner_id = record.id
+            user_input.email = record.email
+            fixed_count += 1
+
+    _logger.info(
+        "survey_record_generation: fixed %d survey.user_input records "
+        "(%d without a matching res.partner)",
+        fixed_count,
+        not_found_count,
+    )
diff --git a/survey_record_generation/models/survey_user_input.py b/survey_record_generation/models/survey_user_input.py
index f8e3930..9dff3f4 100644
--- a/survey_record_generation/models/survey_user_input.py
+++ b/survey_record_generation/models/survey_user_input.py
@@ -39,6 +39,7 @@ class SurveyUserInput(models.Model):
         for user_input in self:
             created_records = {}
             other_record_fields_to_update: list[SurveyRecordCreationFieldValues] = []
+            partner_linked_in_this_run = False
 
             record_creation: SurveyRecordCreation
             for (
@@ -85,8 +86,6 @@ class SurveyUserInput(models.Model):
                     try:
                         with self.env.cr.savepoint():
                             record = self.env[model].create(vals)
-                            if model == "res.partner" and not self.partner_id:
-                                self.partner_id = record.id
                     except Exception:
                         # This a broad exception because it could be IntegrityError,
                         # EmptyNamesError in case partner_firstname is installed etc...
@@ -103,6 +102,17 @@ class SurveyUserInput(models.Model):
                         }
                     )
 
+                if model == "res.partner" and not partner_linked_in_this_run:
+                    # Always reflect the partner actually matched/created from
+                    # this participant's own answers, even if partner_id/email
+                    # were already set on the answer (e.g. inherited from the
+                    # logged-in user when the survey link was opened). Only the
+                    # first res.partner record creation of this run wins, in
+                    # case several are configured on the same survey.
+                    user_input.partner_id = record.id
+                    user_input.email = record.email
+                    partner_linked_in_this_run = True
+
                 created_records[record_creation.id] = record
 
             # update linked record
diff --git a/survey_record_generation/tests/__init__.py b/survey_record_generation/tests/__init__.py
index 5b794a3..7982aab 100644
--- a/survey_record_generation/tests/__init__.py
+++ b/survey_record_generation/tests/__init__.py
@@ -1 +1,2 @@
 from . import test_survey_record_creation
+from . import test_end_migration_16_0_1_0_3
diff --git a/survey_record_generation/tests/test_end_migration_16_0_1_0_3.py b/survey_record_generation/tests/test_end_migration_16_0_1_0_3.py
new file mode 100644
index 0000000..b0ba11b
--- /dev/null
+++ b/survey_record_generation/tests/test_end_migration_16_0_1_0_3.py
@@ -0,0 +1,156 @@
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+import importlib.util
+import os
+
+from odoo.addons.survey.tests.common import SurveyCase
+
+
+def _load_end_migration():
+    migration_path = os.path.join(
+        os.path.dirname(os.path.dirname(os.path.abspath(__file__))),
+        "migrations",
+        "16.0.1.0.3",
+        "end-migration.py",
+    )
+    spec = importlib.util.spec_from_file_location(
+        "survey_record_generation_end_migration_16_0_1_0_3", migration_path
+    )
+    module = importlib.util.module_from_spec(spec)
+    spec.loader.exec_module(module)
+    return module
+
+
+class TestEndMigration160103(SurveyCase):
+    """Covers the use cases the 16.0.1.0.3 end-migration backfill must
+    handle: relinking survey.user_input.partner_id/email to the contact
+    that actually matches each participant's own answers, for submissions
+    whose partner_id/email were left wrong before the fix in this version.
+    """
+
+    def setUp(self):
+        super().setUp()
+        self.migration = _load_end_migration()
+
+        self.survey = self.env["survey.survey"].create({"title": "Test Survey"})
+        self.question_name = self._add_question(
+            page=None,
+            name="Name",
+            qtype="char_box",
+            survey_id=self.survey.id,
+            sequence=1,
+        )
+        self.res_partner_model = self.env["ir.model"]._get("res.partner")
+        self.survey_record_creation = self.env["survey.record.creation"].create(
+            {
+                "name": "Contact",
+                "survey_id": self.survey.id,
+                "model_id": self.res_partner_model.id,
+            }
+        )
+        self.name_field = self.env["ir.model.fields"].search(
+            [("model", "=", "res.partner"), ("name", "=", "name")]
+        )
+        self.env["survey.record.creation.field.values"].create(
+            {
+                "survey_record_creation_id": self.survey_record_creation.id,
+                "survey_id": self.survey.id,
+                "model_id": self.res_partner_model.id,
+                "field_id": self.name_field.id,
+                "value_origin": "question",
+                "question_id": self.question_name.id,
+            }
+        )
+
+    def _submit_answer(self, name):
+        answer = self._add_answer(survey=self.survey, partner=False, email=False)
+        self._add_answer_line(
+            question=self.question_name, answer=answer, answer_value=name
+        )
+        answer._mark_done()
+        return answer
+
+    def _corrupt_with_wrong_partner(self, answer):
+        # Simulate a pre-fix record: partner_id/email point to someone
+        # unrelated to this participant's own answers.
+        wrong_partner = self.env["res.partner"].create({"name": "Wrong Partner"})
+        answer.write({"partner_id": wrong_partner.id, "email": "wrong@test.fr"})
+        return wrong_partner
+
+    def test_migrate_uses_generated_record_when_available(self):
+        # The submission created its own res.partner: the migration must
+        # relink partner_id/email to that exact contact.
+        answer = self._submit_answer("Jean")
+        jean = self.env["res.partner"].search([("name", "=", "Jean")])
+        self._corrupt_with_wrong_partner(answer)
+
+        self.migration.migrate(self.cr, "16.0.1.0.2")
+        answer.invalidate_recordset()
+
+        self.assertEqual(answer.partner_id, jean)
+        self.assertEqual(answer.email, jean.email)
+
+    def test_migrate_falls_back_to_search_when_no_generated_record(self):
+        # The submission matched an already-existing partner instead of
+        # creating one: no survey.generated.record row exists for it, so the
+        # migration must fall back to re-deriving the match through search.
+        jean = self.env["res.partner"].create(
+            {"name": "Jean", "email": "jean@test.fr"}
+        )
+        self.survey_record_creation.write(
+            {
+                "update_existing_records": True,
+                "field_to_retrieve_existing_records": self.name_field.id,
+            }
+        )
+
+        answer = self._submit_answer("Jean")
+        self.assertFalse(answer.generated_record_ids)
+        self._corrupt_with_wrong_partner(answer)
+
+        self.migration.migrate(self.cr, "16.0.1.0.2")
+        answer.invalidate_recordset()
+
+        self.assertEqual(answer.partner_id, jean)
+        self.assertEqual(answer.email, jean.email)
+
+    def test_migrate_falls_back_to_search_when_generated_partner_was_deleted(self):
+        # The res.partner the submission created has since been deleted
+        # (e.g. merged into another contact): the migration must not crash
+        # on the stale reference and must fall back to search instead.
+        self.survey_record_creation.write(
+            {
+                "update_existing_records": True,
+                "field_to_retrieve_existing_records": self.name_field.id,
+            }
+        )
+
+        answer = self._submit_answer("Jean")
+        first_jean = self.env["res.partner"].search([("name", "=", "Jean")])
+        first_jean.unlink()
+
+        # A new contact with the same name takes over.
+        second_jean = self.env["res.partner"].create(
+            {"name": "Jean", "email": "jean2@test.fr"}
+        )
+        self._corrupt_with_wrong_partner(answer)
+
+        self.migration.migrate(self.cr, "16.0.1.0.2")
+        answer.invalidate_recordset()
+
+        self.assertEqual(answer.partner_id, second_jean)
+        self.assertEqual(answer.email, second_jean.email)
+
+    def test_migrate_leaves_answer_untouched_when_no_partner_can_be_found(self):
+        # No survey.generated.record row (e.g. historical data predating
+        # that log) and no way to search (neither update_existing_records
+        # nor unicity_check configured): the migration must leave
+        # partner_id/email as they are instead of guessing or crashing.
+        answer = self._submit_answer("Jean")
+        answer.generated_record_ids.unlink()
+        wrong_partner = self._corrupt_with_wrong_partner(answer)
+
+        self.migration.migrate(self.cr, "16.0.1.0.2")
+        answer.invalidate_recordset()
+
+        self.assertEqual(answer.partner_id, wrong_partner)
+        self.assertEqual(answer.email, "wrong@test.fr")
diff --git a/survey_record_generation/tests/test_survey_record_creation.py b/survey_record_generation/tests/test_survey_record_creation.py
index 37a4150..bcb304e 100644
--- a/survey_record_generation/tests/test_survey_record_creation.py
+++ b/survey_record_generation/tests/test_survey_record_creation.py
@@ -930,6 +930,71 @@ class TestSurveyRecordCreation(SurveyCase):
         partner = self.env["res.partner"].search([("name", "=", "Jean")])
         self.assertEqual(self.answer.partner_id, partner)
 
+    def test_partner_id_and_email_are_corrected_when_creating_a_new_partner(self):
+        # A wrong partner_id/email is already set on the answer (e.g.
+        # inherited from the Odoo user who was logged in when the
+        # /survey/start link was opened). The record creation must still
+        # fill partner_id/email with the contact actually created from the
+        # participant's own answers, overriding that wrong value.
+        wrong_partner = self.env["res.partner"].create({"name": "Wrong Partner"})
+
+        self.answer = self._add_answer(
+            survey=self.survey, partner=wrong_partner, email="wrong@test.fr"
+        )
+        self._add_answer_line(
+            question=self.question_name, answer=self.answer, answer_value="Jean"
+        )
+        self.answer._mark_done()
+
+        partner = self.env["res.partner"].search([("name", "=", "Jean")])
+        self.assertEqual(self.answer.partner_id, partner)
+        self.assertNotEqual(self.answer.partner_id, wrong_partner)
+        self.assertEqual(self.answer.email, partner.email)
+
+    def test_partner_id_and_email_are_corrected_when_matching_an_existing_partner(self):
+        # Same as above, but this time the record creation matches an
+        # already-existing partner (via update_existing_records) instead of
+        # creating a new one: partner_id/email must still be corrected to
+        # that matched partner, not left as the wrong pre-existing value.
+        jean = self.env["res.partner"].create({"name": "Jean", "email": "jean@test.fr"})
+        wrong_partner = self.env["res.partner"].create({"name": "Wrong Partner"})
+
+        self.survey_record_creation.write(
+            {
+                "update_existing_records": True,
+                "field_to_retrieve_existing_records": self.name_field.id,
+            }
+        )
+
+        self.answer = self._add_answer(
+            survey=self.survey, partner=wrong_partner, email="wrong@test.fr"
+        )
+        self._add_answer_line(
+            question=self.question_name, answer=self.answer, answer_value="Jean"
+        )
+        self.answer._mark_done()
+
+        self.assertEqual(self.answer.partner_id, jean)
+        self.assertEqual(self.answer.email, jean.email)
+
+    def test_partner_id_and_email_are_corrected_when_matching_a_duplicate(self):
+        # Same as above, but through the unicity_check/find_duplicate branch
+        # instead of update_existing_records.
+        self.name_survey_record_creation_field_values.unicity_check = True
+        jean = self.env["res.partner"].create({"name": "Jean", "email": "jean@test.fr"})
+        wrong_partner = self.env["res.partner"].create({"name": "Wrong Partner"})
+
+        self.answer = self._add_answer(
+            survey=self.survey, partner=wrong_partner, email="wrong@test.fr"
+        )
+        self._add_answer_line(
+            question=self.question_name, answer=self.answer, answer_value="Jean"
+        )
+        self.answer._mark_done()
+
+        self.assertEqual(self.answer.partner_id, jean)
+        self.assertEqual(self.answer.email, jean.email)
+
     def test_partner_id_in_survey_input_is_filled_up_by_first_contact_record_creation(self):
         # In this test, we verify that when creating several contacts with the same survey,
         # the 1st created contact is used to fill up survey_input.partner_id
@@ -976,3 +1041,58 @@ class TestSurveyRecordCreation(SurveyCase):
 
         partner = self.env["res.partner"].search([("name", "=", "Jean")])
         self.assertEqual(self.answer.partner_id, partner)
+
+    def test_partner_id_is_not_overridden_by_second_contact_record_creation(self):
+        # When several res.partner record creations run on the same survey,
+        # partner_id/email must be corrected to match the first contact
+        # created, and the second contact created must not override that
+        # choice, even though the answer started with a wrong
+        # partner_id/email.
+        self.second_question_name = self._add_question(
+            page=None,
+            name="Name of second person",
+            qtype="char_box",
+            survey_id=self.survey.id,
+            sequence=1,
+        )
+
+        self.second_contact_creation = self.env["survey.record.creation"].create(
+            {
+                "name": "Contact 2",
+                "survey_id": self.survey.id,
+                "model_id": self.res_partner_model.id,
+            }
+        )
+        self.env["survey.record.creation.field.values"].create(
+            {
+                "survey_record_creation_id": self.second_contact_creation.id,
+                "survey_id": self.survey.id,
+                "model_id": self.res_partner_model.id,
+                "field_id": self.name_field.id,
+                "value_origin": "question",
+                "question_id": self.second_question_name.id,
+            }
+        )
+
+        wrong_partner = self.env["res.partner"].create({"name": "Wrong Partner"})
+
+        self.answer = self._add_answer(
+            survey=self.survey, partner=wrong_partner, email="wrong@test.fr"
+        )
+        self._add_answer_line(
+            question=self.question_name,
+            answer=self.answer,
+            answer_value="Jean",
+        )
+        self._add_answer_line(
+            question=self.second_question_name,
+            answer=self.answer,
+            answer_value="Jeanne",
+        )
+        self.answer._mark_done()
+
+        jean = self.env["res.partner"].search([("name", "=", "Jean")])
+        jeanne = self.env["res.partner"].search([("name", "=", "Jeanne")])
+        self.assertEqual(self.answer.partner_id, jean)
+        self.assertNotEqual(self.answer.partner_id, jeanne)
+        self.assertEqual(self.answer.email, jean.email)