I was wandering around a level 93 TZ, and I encountered a boss pack that had Conviction. After killing this boss pack and wandering away, I happened to open my merc’s page to check his damage and noticed he had 1% res fire/light/cold where he normally has 75%. When I removed Infinity, his res reset to 75%. It appears as though after encountering the boss pack’s Conviction, his Conviction started to apply to him as well, at least visually according to the Merc page.
Unsure if this is because Conviction will overwrite one another and in this instance they both happened to have level 12?
I am also noticing this bug. Does seem to actually be applying the negative resistances and not just a visual bug. He has been taking way more damage than normal and has to be revived or healed more frequently.