Import FBX with Import into level get strange parent/child relationship in scene.

I’ve tried to import my FBX file into UE5.4.4 using the File → Import into Level setting.
I got strange parent/child relationship of the imported object.
In the BP editor window, the parent/child relation is as expected.

But the instance of the BP in scene detail editor is strange.

I cannot move the mesh by moving the sceneRoot or the object itself.

How can I get the normal parent/child relationship in scene? Thanks!