Bug with last boss of gnomergan

In the new SoD gnomergan raid i encountered an issue during my first run of the instance a few days ago, during the last fight our groups priest was using the buttons on cooldown to regain mana, almost immediately after clicking the far left one (as you enter room) it activated and i ran over and clicked it, after doing so the bombs continued to spawn from it and for the remainder of the fight i was unable to click any of the buttons, there was no cog wheel and i was in caster form