Hey Hunter folk,
I've had this happen a couple of time, wondering if anyone else cops it;
Sometimes when I disengage out of Garrosh's Desecrate, i'll continue having the debuff icon on me and taking the large tick. That is, until I run back into the desecrate pool and back out again.
Humorous bug that I think has something to do with having 200ms and disengaging 200ms before desecrate hits the ground.