Hello! My first time posting an issue so please be gentle.

I play on a modded server with Malum. We have a lot of mods going on so we're not sure if this is a bug or incompatibility issue. We've yet to test if everything else is working because well- Spirits aren't dropping upon killing something. I know it doesn't work on modded monsters, that's fine. Vanilla mobs of any kind are dropping nothing. Anyone know what we can troubleshoot to fix the issue?