http://youtu.be/bPbHPjBQvJk My guess is that it was more DoT than the cloak removed so it brought you out however I wouldn't put it past ZOS to still not be able to fix broken ability that has been in the game since beta sessions in 2013.
I experienced lots of that due to latency i guess.
When i cast a uppercut against someone who cloaks as soon as i initiated it, the blow is beeing dodged but pops him out all the time.
I assume its like we casted it almost the same time and the game seeks a conclusion for both^^ maybe one of those mobs initiated something when u cloaked.