Can i remove the go up and down the laddder bug?

When walk up and down the ladder. The player now walks on the wrong BG.
It's the same thing with doors. I walk from room 129 to room 113. Now player walks on the wrong BG again.

This is not a bug, but a property. In room 129, press more, to open room properties. Then you will see, staircase1 = leading to room 113, (but the plane must be set to 0). If the plane is 2, you'll end up in the wrong bg.