Guild Wars 2

Hi everyone,
I’m a little curious to what’s going on. I downloaded the patch, and then started to play. I retraited my warrior(since some traits were switched up) and found my final critical chance to be 67%. I have the trait for 15% critical chance with full adrenaline on, and when I get fury, I get 20% critical right? That means, if I use signet of rage, I should go to 85(6720-2 since I get 40 crit per unused signet), and with full adrenaline, 100% right? Yet, when I fought, I had a bunch of non crits even with full fury or adrenaline. This made me think…maybe it’s a 99.9% chance sort of thing? So I swapped out a signet for banner of discipline and planted it down. This put me at 71%.(Original 67-2[signet]6[banner]). With fury, it’s 89%(7120-2) and with full adrenaline, it’s 106%! So I tested it out, sure enough, every 2 or 3 hundred blades, either the first hit or one of the last hits was non critical. I know I sound over-concerned about damage, but if someone could just give me a reason why this is happening, I would be happy, I don’t really care about it being fixed or anything, but why? Is it a trait bug, or one of the things that enhance critical chance isn’t showing up? Or something doesn’t stack with another? Thanks! EDIT: I retried it a few times with the banner(106%) and it seems to be all criticals, so the only real problem is my flat 100% and why it still non crits occasionally.