Garry's mod settings stuck low

My girlfriend’s having a problem with Garry’s mod. Her settings are displaying lower than they are set.
Everything is currently set to full, regarding texture quality and model quality etc, but these are the results ingame:


As you can see, the textures are on low quality.

Not many addons are installed, and we have tried removing some, but the problem remains. We have also tried using -mat_dxlevel’s as launch parimeters, with no luck. This problem also seems to apply to CSS, so I assume, all source games.

Has anyone got any solutions for this?