Bane's Garments

Ok I'm trying to make sense of the individual piece bonuses here because what I'm reading on the site is not lining up with what I'm getting in game. For example, it says with 2 set pieces you get +3 Mana after each kill OR 30% Deadly strike, depending on which two set items you are wearing (assuming 1 has to be the weapon). Well, I can only spawn the +3 Mana after each kill regardless of which other item I wear. This is the same with the 2 either/or bonuses on the armor. I can only get one of them to show up with 2 items on. With 3 items on, the all show up. And one last thing, the bonus for the 2 set items on the

Belt only seems to work for me when I wear all 3. I am tired so maybe I'm missing something, or maybe there is more to this? I only tried equipping it on my Barbarian so far (my Warlock doesn't have enough Dex rn).