It's difficult to fix this. Your fitbit tracks steps by detecting movement of the fitbit - i.e. your wrist - and then working out whether it was the result of a step or just random arm movement. Unfortunately, it's not a precise science and it sometimes gives too many steps, sometimes too few. This is an issue with any wrist-worn tracker (not just fitbits). Have a look at the following help file where fitbit explain a bit more about this and what we can do to minimise it: Help article: How accurate are Fitbit trackers?
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