Like it sometimes reverts back to the time is was before i would do a drawing session, basically not adding the added time spent. For example, if i practiced for 6 hours and say 19 minutes. The next time i would come back, it would say something like 5 hours and 28 mins, or an odd number of time subtracted. This would often sometimes happen when refreshing the page after im done. Sometimes it would'nt even display it.