@ManniAT: turn on timers for the debuffs (or at least cooldown spirals). Anything with a timer/spiral is yours. (You can't see times for debuffs that aren't yours.)
@Dwimmerlaik: Go into the PitBull menu and take a look at the "Hide Blizzard" section. Are they checked off to be hidded? If so, then you have another mod fighting PitBull for control over them. Some HUDs do this.
That was so painfully obvious =X Thanks for pointing it out though =)