baubles disappearing from mod files

Im trying to make a server on 1.7.10 with multiple modes and for some of them (like thaumcraft) i need baubles but every time i install it and then start the server it just disappears as if i never installed it in the first place. Ive tried to reinstall it multiple times but it always does the same thing. Anyone knows why it does that?

carovnyminecraft2.aternos.me

now the server crashes while starting because there are multiple baubles files (thats what error says) but i cant find them so i cant even delete them

thank you for your help but it somehow fixed itself i think. i dont know what happened but it starts normally now and the baubles mod doesnt disappear anymore.