@Sbrunket set the arm to dominate.
Yes there is something going on, the tracker is mounted on the arm, not the leg.
The tracker really has no idea what the feet are doing but has to look at arm motions to determine if the feet are stepping.
Sometimes arm movements may be deceitful and give false input to the tracker, making Fitbit think the legs are stepping.
There will be other times when the feet are moving and the arm movements say, no the are not and steps are lost.
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