I just made a set of "The Arena" armor. I have 2 armor pieces, 2 swords (dual wield), and my alt weapon is a bow (all are from the "Arena" set"). Depending on which bar I'm using, I should alternate between the 3 piece bonus (+175 to Health) and the 4 piece bonus (+175 to health, +390 Armor).
With no weapons equipped (2 pieces of the set, no bonus) I have the following:
Health: 1787
Armor: 1550
With the bow equipped I have the following (3 pieces of the set):
Health: 1962
Armor: 1550
With the 2 swords equipped I have the following (4 pieces of the set);
Health: 1962
Armor: 1550
The tool tip says I have 4/5 pieces equipped, why am I not getting the armor bonus?