I posted a while back about this issue and it seems it's not resolved. I get into the step challenges and as I progress each week I am slowly moved up the challenges from 0 steps to 100,000 a week etc. Then suddenly I am removed from he challenges and it starts at zero again. It's happened again this week. Garmin when are you going to fix this once and for all?!
It's a key component of activity trackers to track progress and improve and it's broken