Rancor skipping turns on cool downs

Pleblo

Rancor is skipping his cool down in phase III and IV. I have been watching his devour so i can time what attacks to hit. Last time he was at 3 on the cooldown and he just devoured someone and it went back to 5. In phase IV it seems to be his berserk. He starts off at 15 then drops to a random number sometimes i have seen him drop down to 8 after the first attack. I think this one might be a display bug because i have seen the counter at 1 and still have 4-5 attacks before he berserks. I have noticed this with other skills. Please look into this this causes us to lose a ton of damage and mess up our strategy.

DanTom

The devour has a cooldown that will decrease if units are less than 50% health at slam. This will drastically change the cooldown cycle. It shows if you hover over the ability.