Regular rancor has double tenacity

After the new update my guild ran a heroic pit raid and once I reached phase two I couldn’t land any debuffs or remove tm. I made it halfway through phase three before losing, and Vader couldn’t land any damage over time, Teebo couldn’t remove any tm. I looked at the rancor’s abilities and he has +50% tenacity while not toppled, on both his pit fighter ability and his fearsome foe ability.

Is this the case for everyone, Im fairly certain it wasn’t like that before the new update.