Shaders Causing Models from the Pointshop to Change Color?

Not sure if this is the best place for this cause I’m not entirely sure it’s a coding problem (I’m not even sure where to start looking in the files if that’s so) but here it goes:

For some reason on most maps now models (specifically chell’s face and the skeletons whole body for example) changes to black, blue, or green randomly. It’s actually kinda cool looking as if that should be a feature (you heard it hear first!). However as this is not supposed to happen and I’ve never seen it as an issue on any other server… Would anyone know why this would be happening?