Ill tell u why, when they changed her armor shatter to also apply an armor break they made it so the armor break is what reduces their armor and increases your damage, when u apply 2 armor shatters it still only applies 1 armor break only reducing their armor 1 time instead of twice like she used to do, all they need to do to fix it is give her an armorbreak for each armor shatter so 1 shatter= 1 armor break, 2 shatters= 2 armor breaks, problem solved. But yeah thats why, next time u put 2 shatters on them youll see 2 shatter debuff icons but only 1 armor break. Ive brought this up a bunch of times but never got an answer, i wouldnt hold your breathe.