Does debuff from this ring stack? =)
Yes, as each ring is a considered a separate source for the debuff.
i mean debuffs from 1 ring staks?
If you mean you have two equipped and they stack, then no.
i mean debuffs from 1 ring
Only one debuff will be active a time and if it procs again, it will replace the old one. So no, it doesn’t stack.