So I've been toying around with a few rotations on my Ranger, and something interesting happened. I Clicked Upper Attack, Lower Attack, Penetrating Shot, and instead of going on an 8 second cooldown, it went on a 15 second cooldown. So I looked in my combat log to see if I missed my Upper or Lower, and both landed. So I have been sitting here just clicking Upper and Lower attack over and over until Penetrating Shot comes off cooldown to see if I could replicate it, making sure to keep my eyes at the top of the screen to make sure the arrow buffs appear, and it happened again. Is this just a known bug?