The HP bonus above 100%( from killing ) had changed the gameplay, a bit. I've discussed with Aaron, we think that it's not a good changes and we should keep it as how it was. So, we have decided to pull the update back to keep the gameplay fair for newbies and experienced players. Even though, the HP addon limit from mystery box is still 250 and the bug that caused your HP to become 100( while you have more than 100 HP ) was fixed.