I've has issues with this recently as I was rolling 2H/DW and using my 2H bar for gap closing, then switching to my DW bar for damage....and I found that my problem was that I was spamming my bar swap key in the heat of the moment and actually not switching bars. It's frustrating when I think I'm hitting my target with Bloodthirst when in reality I'm spamming Shuffle and now I'm out of stamina haha.