So a couple of times already, I have gotten a bug where I joined into a Heroic Escalation and the only way I could move was via dodging. It seemed to be a theme with it that I would join into the escalation before anyone readied up and before the timer ran out but when I got into the timer was still going and ended up going into the negatives, just a little note I'm on PC and I don't know if that has anything to do with it.
Hey there, did you try the "Help My character is stuck" button in the help section in the menu? Has this happened a few times on your end?