Player firing animations/checkered reflections

So lately I’ve noticed that when I fire a weapon (viewing through thirdperson or from a camera) my model just stands straight up. Also, sometimes, usually after I leave a server after it crashes, everything on the map gets this purple and black “shine”. It’s the same as a missing texture, but it’s sorta hard to explain… Almost like the light in the map is missing a texture?

I’ve had similar problems but only certain maps