Ipad: game showing incorrect mana balance

On Ipad the mana graphics is often showing the incorrect balance after playing a few cards. It typically indicate that I have a few mana left when I don’t. The numerical value is always correct though. This is a bug that has been around for a long time an has caused me countless misplays as I tend to look at the graphical mana counter when playing fast.

Too bad I can’t upload any screenshots. I have plenty.