diff --git a/CHANGELOG.md b/CHANGELOG.md
index 39b1625..f81c907 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Fixed
 
+- Fixed Custom Dropdown filtering in table questions to only display values from the configured dropdown definition
 - Fix string condition operators (equals, contains, length) not being available on hidden questions
 
 ## [1.2.0] - 2026-07-28
diff --git a/src/Model/QuestionType/TableQuestion.php b/src/Model/QuestionType/TableQuestion.php
index 84889cf..5fc3fd0 100644
--- a/src/Model/QuestionType/TableQuestion.php
+++ b/src/Model/QuestionType/TableQuestion.php
@@ -553,11 +553,22 @@ private function resolveItemNames(string $itemtype, array $values): array
 
         global $DB;
 
+        $where = ['id' => $ids];
+
+        // GLPI 11 custom dropdown classes can share the same database table.
+        // Their system SQL criteria restrict rows to the current dropdown definition.
+        if (method_exists($itemtype, 'getSystemSQLCriteria')) {
+            $system_criteria = $itemtype::getSystemSQLCriteria();
+            if (is_array($system_criteria) && $system_criteria !== []) {
+                $where[] = $system_criteria;
+            }
+        }
+
         $map = [];
         foreach ($DB->request([
             'SELECT' => ['id', 'name'],
             'FROM'   => $item->getTable(),
-            'WHERE'  => ['id' => $ids],
+            'WHERE'  => $where,
         ]) as $row) {
             if (!is_array($row)) {
                 continue;
@@ -950,6 +961,15 @@ private function buildGlpiItemtypeOptions(string $itemtype): array
 
         $where = [];
 
+        // GLPI 11 custom dropdown classes can share the same database table.
+        // Their system SQL criteria restrict rows to the current dropdown definition.
+        if (method_exists($itemtype, 'getSystemSQLCriteria')) {
+            $system_criteria = $itemtype::getSystemSQLCriteria();
+            if (is_array($system_criteria) && $system_criteria !== []) {
+                $where[] = $system_criteria;
+            }
+        }
+
         if ($item->maybeDeleted()) {
             $where['is_deleted'] = 0;
         }
diff --git a/tests/Model/QuestionType/TableQuestionTest.php b/tests/Model/QuestionType/TableQuestionTest.php
index 24c8e99..9108744 100644
--- a/tests/Model/QuestionType/TableQuestionTest.php
+++ b/tests/Model/QuestionType/TableQuestionTest.php
@@ -33,6 +33,8 @@
 
 namespace GlpiPlugin\Advancedforms\Tests\Model\QuestionType;
 
+use Glpi\Dropdown\DropdownDefinition;
+use Glpi\Dropdown\DropdownDefinitionManager;
 use Glpi\Form\QuestionType\QuestionTypeCheckbox;
 use Glpi\Form\QuestionType\QuestionTypeEmail;
 use Glpi\Form\QuestionType\QuestionTypeFile;
@@ -45,6 +47,7 @@
 use GlpiPlugin\Advancedforms\Model\QuestionType\TableQuestion;
 use GlpiPlugin\Advancedforms\Model\QuestionType\TableQuestionConfig;
 use GlpiPlugin\Advancedforms\Tests\AdvancedFormsTestCase;
+use ReflectionMethod;
 
 final class TableQuestionTest extends AdvancedFormsTestCase
 {
@@ -247,4 +250,89 @@ public function testTransformConditionValueSkipsNonArrayRows(): void
         $result = $this->type->transformConditionValueForComparisons($answer, null);
         $this->assertSame(['10.0.0.1'], $result);
     }
+
+    public function testCustomDropdownOptionsAreRestrictedToConfiguredDefinition(): void
+    {
+        [$itemtype, $allowed_id, $other_id] = $this->createCustomDropdownFixture(
+            'af_table_options',
+        );
+
+        $method = new ReflectionMethod(
+            TableQuestion::class,
+            'buildGlpiItemtypeOptions',
+        );
+
+        $options = $method->invoke($this->type, $itemtype);
+
+        $this->assertIsArray($options);
+        $this->assertArrayHasKey((string) $allowed_id, $options);
+        $this->assertSame('Allowed option', $options[(string) $allowed_id]);
+        $this->assertArrayNotHasKey((string) $other_id, $options);
+    }
+
+    public function testCustomDropdownStoredValuesAreRestrictedToConfiguredDefinition(): void
+    {
+        [$itemtype, $allowed_id, $other_id] = $this->createCustomDropdownFixture(
+            'af_table_values',
+        );
+
+        $method = new ReflectionMethod(
+            TableQuestion::class,
+            'resolveItemNames',
+        );
+
+        $values = $method->invoke(
+            $this->type,
+            $itemtype,
+            [(string) $allowed_id, (string) $other_id],
+        );
+
+        $this->assertIsArray($values);
+        $this->assertArrayHasKey((string) $allowed_id, $values);
+        $this->assertSame('Allowed option', $values[(string) $allowed_id]);
+        $this->assertArrayNotHasKey((string) $other_id, $values);
+    }
+
+    /**
+     * @return array{class-string, int, int}
+     */
+    private function createCustomDropdownFixture(string $system_name): array
+    {
+        $allowed_definition = $this->createItem(DropdownDefinition::class, [
+            'system_name' => $system_name . '_allowed',
+            'label'       => 'Allowed dropdown',
+            'is_active'   => 1,
+        ]);
+
+        $other_definition = $this->createItem(DropdownDefinition::class, [
+            'system_name' => $system_name . '_other',
+            'label'       => 'Other dropdown',
+            'is_active'   => 1,
+        ]);
+
+        // Refresh definitions so GLPI can autoload both concrete
+        // Glpi\CustomDropdown classes created above.
+        DropdownDefinitionManager::getInstance()->bootDefinitions();
+
+        $allowed_itemtype = $allowed_definition->getDropdownClassName();
+        $other_itemtype   = $other_definition->getDropdownClassName();
+
+        $this->assertTrue(class_exists($allowed_itemtype));
+        $this->assertTrue(class_exists($other_itemtype));
+
+        $allowed_item = $this->createItem($allowed_itemtype, [
+            'name' => 'Allowed option',
+        ]);
+
+        $other_item = $this->createItem($other_itemtype, [
+            'name' => 'Other option',
+        ]);
+
+        return [
+            $allowed_itemtype,
+            (int) $allowed_item->getID(),
+            (int) $other_item->getID(),
+        ];
+    }
+
 }