The Irontree Breastplate Armor has a feature that is supposed to boost your damage thresholds by +2 when you have run out of Armor Slots.
However, when the armor is set to Active it adds that modifier even if you still have Armor Slots.
Looking at the item itself in the Equipment tab it appears to have a counter I can only assume you are supposed to use to use to indicate when you use Armor Slots, but it seems to be doing nothing.
Thank you for your continued work.