Skybox Issues! Help!

[Jazz]

Hello, this is Jazz,

Recently, I have been having a reoccurring issue with the skybox in the maps I load into on Gmod. The issue I have been having is that four of the walls along the skybox are different from what the actual skybox is supposed to be. I have provided a link to the image below that I posted to my account that shows the problem in gm_charon. If someone can tell me how I can fix this issue, I would absolutely appreciate the help.

Thank you,
JazzSolo84

Image: https://steamcommunity.com/sharedfiles/filedetails/?id=3373053293

[Jazz]

UPDATE: I tried the other worlds I have and the skybox worked just fine. So I guess its with certain worlds. Still though, help with this issue would absolutely be appreciated.