Resistance debuff stacking?

I’ve been reading about some debuff sources stacking but others not, and it’s all kinda confusing. So on my pyromancer, would the chaos res debuffs from Edlricht Fire devotion, Soleal’s flame, hellfire mine, and the darkflame debuff on Exterminus all stack? Or do I have some redundancy that I can get rid of there?

Yep they stack!

This resistance debuff cheat sheet is very handy:

The debuff type to stack is “-n% [x] resistance” (Category B).