Weapon Skin Bug

I use RSG-CORE, a couple days ago when I bought or gave myself a weapon the skin was fine, but I think since I updated the artifacts when I give myself a weapon it just does some bug and the skin of it just bugged out (see picture bellow). I returned to the artifacts prior to the update and its still the same! Any Idea how to fix this?

Btw, just checked and it doesnt work on certain weapon, bolt action, navy revolver etc… there are some weapons that are working normally