My map's textures are doing strange things in some spots.

The title speaks for itself, and i don’t know how to fix it.
How it looks in Hammer and should look in the map:

How it looks when i launch Gmod:

Any Help would be greatly appreciated!

Post your compile log.

This is usually a telltale sign of unoptimized geometry. I would guess most if not all of the thin brushes (such as trims and railings) are not func_detail?

Thanks for your help! You were right i didn’t have all of the thin brushes as func_detail.