diff --git a/src/pages/task/ProjectView.jsx b/src/pages/task/ProjectView.jsx
index 679371f..405b5b2 100644
--- a/src/pages/task/ProjectView.jsx
+++ b/src/pages/task/ProjectView.jsx
@@ -114,8 +114,13 @@ export default function ProjectView({ projectId, onProjectChanged, onProjectExit
     if (ti < 0) return
     rest.splice(after ? ti + 1 : ti, 0, task)
     const flat = groups.map((l) => (l === g ? rest : l)).flat()
-    const orderOf = new Map(flat.map((t, i) => [t.id, i]))
-    setTasks((prev) => (prev || []).map((t) => (orderOf.has(t.id) ? { ...t, sortOrder: orderOf.get(t.id) } : t)))
+    const flatIds = new Set(flat.map((t) => t.id))
+    // 乐观更新必须重排数组本身 —— 列表分组渲染按数组顺序,
+    // 只改 sortOrder 字段界面不会动 (打卡侧即按此口径)
+    setTasks((prev) => [
+      ...flat.map((t, i) => ({ ...t, sortOrder: i })),
+      ...(prev || []).filter((t) => !flatIds.has(t.id)),
+    ])
     try {
       await taskApi.reorder(projectId, flat.map((t) => t.id))
     } catch (e) {