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. 
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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
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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?