This is probably caused by the overlapping RoF fix, it used to be that you could stack RoFs on top of each other in the same spot and they would each do individual damage for crazy aoe and ember generation.
Perhaps the fix needs a bit of fine tuning,

Quest Objective: Spread cancer all over Freakz.
Quest Status: Quest failed
You can play the entire game from ur Garrison/SW/OG nice mmo would play again Kappa. Retail WoW 2016™