I have 41.96% mastery (42% is shown in stats panel). And when I go mouse over 42% it says increased damage while enraged by 45% because of 3/4 raging berserker trait. But when I purchased a new trait and got raging berserker to 4/4 the tooltip still says 45% instead of 46% now. Is it a bug? Is it calculated into damage and just a tooltip bug? Anyone knows this?