Help with weird stuff on ceiling

[BackwardsFace]

I have no idea what this is, so here we go.

What happened? Please tell me. Also, this is an eventual Sugoi 2 super-speedmap. Super-speedmap meaning made in a few days (in this case, because of deadlines.). Textures are Freedoom.

 

[Fres]

If you're facing a texture or sector in 3D mode, the area will be highlighted yellow, or red if it's selected. Everything's fine.

 

[BackwardsFace]

If you're facing a texture or sector in 3D mode, the area will be highlighted yellow, or red if it's selected. Everything's fine.

I know. I mean the weird hanging linedefs.
EDIT: Also, somebody please move this to editing help.

 

[Boinciel]

Those are the midtextures on those linedefs. Midtexures occupy the space between floor and ceiling and are how GFZ has grass edges, for example.

 

[BackwardsFace]

OH. I should've put two and two together.