diff --git a/backup/moodle2/restore_stepslib.php b/backup/moodle2/restore_stepslib.php
index c1c749322a4..40edbe74820 100644
--- a/backup/moodle2/restore_stepslib.php
+++ b/backup/moodle2/restore_stepslib.php
@@ -1859,9 +1859,13 @@ class restore_section_structure_step extends restore_structure_step {
             [$this->get_courseid()],
             'section DESC', 'id, section'
         );
+        // Here we add the new section to the end of the list so we make sure that all delegated sections are really
+        // all located after the normal sections. We can have case where delegated sections are located before the
+        // normal sections, so we need to move them to the end (mostly in the restore process more than in the duplicate
+        // process in which the order sections => delegated section is mostly there).
+        $sectionnum = $sectionnum + count($sectionstomove);
         foreach ($sectionstomove as $section) {
-            $sectionnum++;
-            $section->section = $sectionnum;
+            $section->section = $sectionnum--;
             $DB->update_record('course_sections', $section);
         }
     }
diff --git a/course/format/tests/base_test.php b/course/format/tests/base_test.php
index 2911ad3d1bd..7c9671516ae 100644
--- a/course/format/tests/base_test.php
+++ b/course/format/tests/base_test.php
@@ -570,6 +570,45 @@ final class base_test extends advanced_testcase {
         $this->assertEquals($originalmodcount - 1, $newmodcount);
     }
 
+    /**
+     * Test duplicate_section() with delegated section
+     * @covers     ::duplicate_section
+     */
+    public function test_duplicate_section_with_delegated_sections(): void {
+        global $DB;
+
+        $this->setAdminUser();
+        $this->resetAfterTest();
+        // Add subsection.
+        $manager = \core_plugin_manager::resolve_plugininfo_class('mod');
+        $manager::enable_plugin('subsection', 1);
+        $course = $this->getDataGenerator()->create_course(['format' => 'topics', 'numsections' => 1]);
+        $subsection1 = $this->getDataGenerator()->create_module(
+            'subsection', ['course' => $course, 'section' => 1, 'name' => 'subsection1']);
+        $subsection2 = $this->getDataGenerator()->create_module(
+            'subsection', ['course' => $course, 'section' => 1, 'name' => 'subsection2']);
+        $format = course_get_format($course);
+
+        $modinfo = get_fast_modinfo($course);
+        $sectioninfo = $modinfo->get_section_info(1, MUST_EXIST);
+        $originalsectioncount = $DB->count_records('course_sections', ['course' => $course->id]);
+        $this->assertEquals(4, $originalsectioncount);
+
+        $originalsection = $DB->get_record('course_sections',
+            ['course' => $course->id, 'section' => 0],
+            '*',
+            MUST_EXIST);
+        $newsection = $format->duplicate_section($sectioninfo);
+        foreach ($originalsection as $prop => $value) {
+            if ($prop == 'id' || $prop == 'sequence' || $prop == 'section' || $prop == 'timemodified') {
+                continue;
+            }
+            $this->assertEquals($value, $newsection->$prop);
+        }
+        $sectioncount = $DB->count_records('course_sections', ['course' => $course->id]);
+        $this->assertEquals(7, $sectioncount);
+    }
+
     /**
      * Test for the default delete format data behaviour.
      *