The first three buffs are Blood Chilled, Missile Dampener, and Cyclone. Are some bosses supposed to have 3 buffs (and this is very strong btw lol) or is this a bug? If it's a bug, then I can try to pay more attention and see if there is some way to help narrow down said bug.
Sometimes a bounty will receive a minion buff, and will keep it until he/she dies, making it way harder to kill. When it happens the bounty will always show 3 buffs, and the 3rd should be Cyclone or Soul Link.
(Note that these affixes can work correctly, too - but in that case the bounty will have only 2 buffs)
Already reported, but more reports shouldn't hurt.
I believe the bug occur when there is more than one instance going and somehow Affix that work like aura also affect the other instance, like the cyclone is the most annoying one since everything including the bounty you hit will have the cyclone even when it is the last one standing. I haven't saw a triple non aura yet.
I don't think any of the minion have affix on their own.