I noticed this bug since last update or two, but was too lazy to report it. Simply put, whenever you are in super transform (didnt test normal one but i bet its the same), if your energy charge reaches max, and you enter bubble stage, after the bubble runs out your transform icon will refresh, but still have the same amount of time left. That means that if the transform icon is half grey (60 secs left out of 2 mins) and it gets resetted, it will look full, but will empty out twice as fast (and run out after another 60 seconds). This does not affect the actual duration of the skill, its purely visual. (similar to combo orbs on hero if they use coma or panic). Because this started recently, i think that something that was changed last update caused this I might upload a vid later