I don’t know if this carries over into damage calculations (I assume it does), but whenever an item you equip says it adds to ‘mortal resistances’, this bonus shows up for only mortal fighters. The defense/attack show up as working as normal. I hope this gets fixed soon, since two of my items add mortal resistances, the round shield and artful nomad helmet (which I did the testing with).
I’ve been testing this for around half an hour and I’m sure that’s the issue. Looking through the glitch thread someone noticed a similar occurrence with the nomad helmet and thought that the artful part of it was simply broken. Another issue I’ve heard is that pilgrim’s boots seem to add resistances only to mortal healers despite saying they add them to all healers.