I don't know where to put this but ..
I was on my DoK Elflol today during a keep siege and I noticed that my group heal was completely healing whoever it hit. I don't know how it happened but I noticed the tank getting healed 300+ 3-5x every time I cast. The only 2 buttons I used was the frontal aoe dmg and group heal.
The tank was unstoppable but I was too squishy and got ran over by a melee train a few times. But not before watching my life bar bounce from 10ish % to full health a couple times. Powerful healing bug indeed.