I am not sure if I am reading this correct; however please see the following:
Unwavering Faith IV = Spell Effects: Places you in a defensive combat stance that causes you to take less damage
Description = Slot 8: Decreases Melee Mitigation by -15pct
Does that count as a double negative; so, therefore it is a +15pct melee mitigation? If so, please ignore. Otherwise, perhaps it should be changed?
Thanks for your help,
-- Olde