I found this bug on iPhone 7 today. The hero was misplaced in Arena and I lost control of the hero.
At the start of the fight I moved my Darrion to the middle then enemy hero moved and stand on top of my Darrion. I lost control of my Darrion I had to tap "Auto" to proceed and I didn't get the points for having my Darrion on the flag tile while the opponent got the points. This continue until the fight is done. This is the first time it happened.