based on my previous knowledge with this game
you need to
"matan, now i get what you meant a few years back when you said that "the level in mbg is beyond me" after the last rampage i noticed things were insane, and now i truly feel that too" - Dushine, 2015.
The following user(s) said Thank You: Jeff, snowbody, J@ckRB, Three, Ralph, Derpking, mariotwo, GhostKoi
Try going into constructor, selecting all the verticies, setting your grid spacing really low (0.015625) is good, and then going into Modify -> Quantize. Try converting the map then, and if it doesn't work, send the file to me and I'll have a look. Make sure you backup the map before quantizing!
avi had this same glitch when he was making a ring for a track (like, for running and sprints) with lots of concentric ovals- I have a clip on his laptop that I can upload if you want. I think it's caused by too many overlapping faces? If I were you I'd try removing alternating rings and putting them in a separate interior, then aligning them with level editor in you level. Hope that helped
EDIT: ooh, got ninja'd by Threefolder, nevermind me
Matan's jokes literally aren't funny. Why is he getting thank yous?
I did what Threefolder said, but then M2D decided to move faces around, then I split the interior in half, alternating pie slices, and M2D moved faces around on both again. Quantizing removes the sky glitch, but doesn't fix the misplaced faces. I also split a non-quantized copy into two, and still got the sky glitch.
Threefolder, I have the map file in my first post.