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Could that have started following a software update to your Versa 2? If so, it will be down to a change in the way heart rate zones are calculated. They were based just on our age but now also take into account our resting heart rate. Many of us have found that the new heart rate zones are more difficult to reach. There's more information on the new zones in https://help.fitbit.com/articles/en_US/Help_article/1565.htm
Best AnswerYes I've had the same issue and the active zone minutes are definitely not calculated correctly ... not happy with this update at all ... can't even read texts on my wrist on the Versa 2 but can on predecessors!!! .... wish I had just stuck with my Garmin
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