I do not have one of these devices, but if you go to Google, and search "fitbit inaccurate distance" you will see a lot of info, also I saw threads on calibrating the device. Your post does not indicate if the error was from day one or if it has occurred recently. If from day one, it might be a setup problem.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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