Swep viewmodels broken/invisible

So on my server the viewmodels for all the weapons (popcorn, glowstick, swords, etc) isn’t appearing while in first person. I have been trying to track the problem but I just can’t see anything that could’ve broken them…

Are there any known causes of this problem? If so, I’d like a solution to fix this problem or just something that could help me fix it myself.

Thank you!