Bugged Doors in Dark Castle

Today I wanted to go huntin' Kitanas, so I went to the Switch...
But where normaly was the door, wasn't anything, but I could not pass.



Then I checked other Doors in Dark Castle.
I found two more of this bugs:





Then I found a door, I opened it and it disappeared. I could not pass, too.




I hope you can fix that bugs

There are even more (go to diabolic imps and then the way to dark monks, also bugged).