Already posted this on the PitBull WoWAce thread but not much luck there, so hopefully someone here has a solution of sorts.
I've been having a problem with PitBull for a VERY long time, and it's stayed with me despite completely rebuilding my UI from scratch 3 times. It's a little bit hard to describe in words, so here's a couple of pics.
Take close note of the debuff icons underlined in RED.
- I magically become a rogue that somehow manages to apply a 5 stack of Rupture to the target.
- Before putting on my Wizard Hat and becoming a shadowpriest; SW:Pain manages to become a 5 stack, and a 1 stack separately. Shadow Vulnerability is fine, Misery becomes a 3 stack... and I'm about half way through my cast of Mind Flay... all as a warrior.
Please note that I am a warrior.
Basically, the debuffs occasionally screw up as above and generally the only way to fix it is to target another mob before going back to your original target. However, waiting it out sometimes works too. Spriest/Rogue debuffs are not the only ones to show up, I have also seen 5 stacks of TClap, Demo shout, etc.