I know another server who has the same setup, apparently creatures were spawning on the island too

That is too bad :/ Well, need to play without this mod then :(

you don't need to have identical mod load outs for clusters. things you should have the same are stack mods, modded dino mods(ie ark addtions the collection), or other addtional content mods so items and dinos can be moved between servers without poofing. Any mod that doesnt add content such as this mod can be loaded solely on one map without it negatively impacting other maps.

that is true, I have a cluster setup with different mods that work well - I use hazestacks usually caus it has exceptional transfer rules

So I can add this mod for Valguero without adding it to Island? :o <3