From CurseForge:

Hi，when I install primitive mobs mod and your rough mobs mod on sponge at the same time，the primitive mobs does not generate any mobs，while There is no such problem in single player games.

Because your mod is really great, I have to delete primitive mobs, but if there is a solution, it is the best！

I don’t use sponge and have no idea hot to set that up. I didn’t even know it would work on sponge. I will need more details to investigate.

How to set up server. What software to use. Etc.