Rewards Not Resetting

I've really loved using Circle on my Orbi and it is making a huge impace in controlling and monitoring my childrens internet usage.  However, when I issue them a reward, the reward doesn't reset at the end of the day. So if I extend their time today for an hour, tomorrow that extra hour is still on their rewards, and the day after that, and the day after that.  So, I am having to go in and remove the reward the day after I issue it. 

All of the documentation I have read indicates that it should be removed automatically at the end of the day.  Am I doing something wrong or is there a bug?