Skin not showing up in game, but other skins I've made work fine. Skin worked, but suddenly stopped.

I made a skin and it worked! correct material.cs and jbeam, and it was cool. then, without touching anything, the skin shows up as whatever the colors of the car are with no design in game. i didn’t touch anything, and the skin now doesn’t work. to make things weirder, another skin i made that uses the exact same format of jbeam and materials.cs (only changes being the name of the file/skin) and that skin works like normal

i dont know what to do, i validated the files and it did absolutely nothing to fix my problems