Whenever I have this mod enabled in lunar client it crashes every time on launch.

Lunar and Particle Core. Fzzy Config is the config library used by Particle Core, it wouldn't be incompatible

Between particle core and fzzy config? Or lunar and particle core?

That sounds like Lunar Clients fault, more than Fzzy Configs. If you have Fzzy Config installed because of Particle Core, that is a known incompatibility between those two.

I have no idea why lol it just started working again for no reason. It might be because I recently updated my modpack and made some changes but yea it works now.