I created a tunnel in my zombie map, and in radiant the tunnel walls are visible but when i start up the map, only some of them are missing. This only happens in my tunnel. I have tried 3 different textures, all do the same thing on the same wall. I'm thinking it has to do something with my lights but i can't really figure it out.

please post a screenshot

did you check the lightmap? (Shift+L)

yeah... this definitely sounds like a stretched Light map.

either use shift L or up n the top bar there is a button which flips the world from Texture - Light - Smoothing

In L map (white and gray checkerboard), select your tunnel and hit either LMAP or Natural.

recompile and test, and it should be fixed.

If it isn't the lightmap, are the texture custom?

Okay so i hit Lmap and natural but now it doesn't compile right for some reason. I press compile and it just does its thing and then it stops and nothing happens. and no these aren't custom textures

Sound like a bad patch then, try replacing it and compiling again.

Okay compiling works again. But i still have no walls lol
Heres a pic:

Image