So, I've just added a bunch of custom maps and most of them work without an issue, but there are a few that aren't. I warp to them fine, no crashes, but the majority of the map shows up just as black space, it seems to be all of the area that my character can walk in. Things like staircases, room decorations (plants, boxes/crates, etc) show up, but the floor/ground of the map does not. I have the .gat, the .gnd, the .rsw - nothing seems different between these and the maps that work. I can't figure it out. Any ideas?
A screenshot of what I'm dealing with: