03-06-2016 03:19
03-06-2016 03:19
03-06-2016 04:16
03-06-2016 04:16
This is a common issue with any wrist-worn tracker (not just fitbits). They work by detecting movement of the tracker and deciding whether that movement was the result of a step or just random arm movement. They sometimes get it wrong. There's more information on this - and what we can do to minimise it - in this help article:
http://help.fitbit.com/articles/en_US/Help_article/How-accurate-are-Fitbit-trackers/