It's not something that we can fix completely. Your fitbit - like any wrist-worn tracker - tracks steps by detecting movement of the tracker i.e. your wrist, and then deciding whether that movement was the result of a step or just random arm movement. It's not a precise science and sometimes it gives too many steps, sometimes too few.
Have a read of the following help file where fitbit explain this in more detail and describe how we can minimise the problem: Help article: How accurate are Fitbit trackers?
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