I'm really surprised that this change (80% resistance cap) accompanied by breaking the zombie skill was missed by their QA team.
Ah, so that's the reason. I registered to report this bug, because it's game breaking for me (over 100 hours into the game!). I tried to load different save games, because the save game could have been corrupted. I also did screenshots for documentation and tried to unequip and equip items with poison resistance to force a recalculation. I am surprised that it's such a simple bug.
