Hi @mahyarSOORANI,
It's not a bug, seems to be the stock door family?
They have filled regions in them as frame, that's what you're seeing. The filled regions are in all three detail levels so you can't get rid of them without editing the family. (turning the detail item category off in the view doesn't solve it either)
Edit the Door family and edit the filled region detail levels so that there's one level that doesn't have any filled regions and set you're floorplan to that level.
Also the door leaf isn't throwing a shadow (and floor section for that!), because the door geometry is turned off in 2D floorplan view.
Another option (without editing the family) is to use a 3D view and orient it to the floorplan, but you won't see any of the 2D elements.
- Michel