It sounds like the portalling is messed up. I'd delete all the portals in your map, and also delete the MAPNAME.d3dprt file
Then compile try again
I think it might be best to remove that whole area and remake it from scratch, but in another location. So, maybe add a hallway that goes to it after you remake it.
This tutorial will show you how to replace the bloody, maimed DLC3 zombie textures (https://gyazo.com/79b7fa2a35996c326c741ff16839f994) with the old, flesh colored Nacht Der Untoten zombie textures ([url=https://gyazo....