Dwarven Boulder Helm
 

How do I get the +2 "bonus" against confirming critical hits to show up? I'm getting the "bonus" from the advanced weapon training: critical deflection to show (currently at +5 due to character being level 15) but not the additional +2 from the helmet. I see no reason why these two wouldn't stack as Critical deflection appears to be a type-less bonus.

I've removed the critical deflection option and my bonus from the helmet does not show. The helmet is equipped (tried both hands), and I am seeing other bonuses from it showing (I added the Defending weapon enchantment to the helmet and it is available). Am I missing something or is this a bug?