Clipping planes are messed up

For the last 1-2 months I have noticed that anything that uses clipping planes causes weird visual bugs on the model being clipped and anything behind it. I have tried removing all addons and my lua folder and even a complete re-install of Garrysmod. Here are some examples of the bug:

Anyone have any ideas? This makes things very difficult to develop anything related to clipping planes as they are even more broken then just the graphical bugs.