diff --git a/app/Http/Controllers/Business/SystemizationTodos.php b/app/Http/Controllers/Business/SystemizationTodos.php
index 650b4c21..3e4437f2 100644
--- a/app/Http/Controllers/Business/SystemizationTodos.php
+++ b/app/Http/Controllers/Business/SystemizationTodos.php
@@ -195,9 +195,9 @@ class SystemizationTodos extends Controller
             $section = $this->hierarchyLabel($todo->section);
 
             return [
-                'category_key' => $category === '' ? "\0" : $category,
+                'category_key' => $this->hierarchyGroupKey($category),
                 'category_label' => $category,
-                'section_key' => $section === '' ? "\0" : $section,
+                'section_key' => $this->hierarchyGroupKey($section),
                 'section_label' => $section,
                 'sort_order' => (int) $todo->sort_order,
                 'id' => (int) $todo->id,
@@ -216,12 +216,12 @@ class SystemizationTodos extends Controller
                 $categoryOrder[$categoryKey] ?? PHP_INT_MAX,
                 $row['sort_order'],
             );
-            $categoryLabels[$categoryKey] = $row['category_label'];
+            $categoryLabels[$categoryKey] ??= $row['category_label'];
             $sectionOrder[$categoryKey][$sectionKey] = min(
                 $sectionOrder[$categoryKey][$sectionKey] ?? PHP_INT_MAX,
                 $row['sort_order'],
             );
-            $sectionLabels[$categoryKey][$sectionKey] = $row['section_label'];
+            $sectionLabels[$categoryKey][$sectionKey] ??= $row['section_label'];
             $groupedRows[$categoryKey][$sectionKey][] = $row;
         }
 
@@ -299,6 +299,18 @@ class SystemizationTodos extends Controller
         ));
     }
 
+    private function hierarchyGroupKey(string $label): string
+    {
+        $normalized = preg_replace(
+            '/[\s\p{Z}\x{200B}\x{FEFF}]+/u',
+            '',
+            $label,
+        );
+        $normalized = (string) $normalized;
+
+        return $normalized === '' ? "\0" : mb_strtolower($normalized);
+    }
+
     public function store(Request $request): RedirectResponse
     {
         $data = $this->validated($request);
diff --git a/tests/Feature/Business/SystemizationTodosTest.php b/tests/Feature/Business/SystemizationTodosTest.php
index 1fb00a51..f8b310bc 100644
--- a/tests/Feature/Business/SystemizationTodosTest.php
+++ b/tests/Feature/Business/SystemizationTodosTest.php
@@ -307,13 +307,15 @@ class SystemizationTodosTest extends FeatureTestCase
     {
         $this->loginAs();
 
-        $pending = $this->createTodo('收入', '钉钉流程', '待办事项 A', '2026-10-30', 1);
-        $completed = $this->createTodo('收入', '钉钉流程', '待办事项 B', '2026-10-10', 2);
+        $mergedSection = '钉钉流程，纳税人 3、盘点';
+        $mergedSectionVariant = '钉钉流程，纳税人3、盘点';
+        $pending = $this->createTodo('收入', $mergedSection, '待办事项 A', '2026-10-30', 1);
+        $completed = $this->createTodo('收入', $mergedSectionVariant, '待办事项 B', '2026-10-10', 2);
         $completed->update([
             'status' => SystemizationTodo::STATUS_COMPLETED,
             'completed_at' => '2026-10-10',
         ]);
-        $inProgress = $this->createTodo('收入', '钉钉流程', '待办事项 C', '2026-10-20', 3);
+        $inProgress = $this->createTodo('收入', $mergedSection, '待办事项 C', '2026-10-20', 3);
         $inProgress->update(['status' => SystemizationTodo::STATUS_IN_PROGRESS]);
         $secondContent = $this->createTodo('收入', '报销流程', '待办事项 D', '2026-11-01', 4);
         $cost = $this->createTodo('成本', '成本核对', '待办事项 E', '2026-11-02', 5);
@@ -354,12 +356,16 @@ class SystemizationTodosTest extends FeatureTestCase
         $this->assertSame(
             [$completed->id, $inProgress->id],
             $items
-                ->where('section', '钉钉流程')
+                ->where('type_sequence', 1)
+                ->where('content_sequence', 1)
                 ->whereIn('status', [SystemizationTodo::STATUS_COMPLETED, SystemizationTodo::STATUS_IN_PROGRESS])
                 ->pluck('id')
                 ->all(),
         );
-        $this->assertSame(1, substr_count((string) $response->getContent(), '>钉钉流程<'));
+        $this->assertSame(
+            1,
+            substr_count((string) $response->getContent(), '>' . $mergedSection . '<'),
+        );
     }
 
     public function test_page_renders_all_todos_on_one_continuous_list(): void