Seems there's a bit of a bug in the app when sharing exercise results - if you have your units set to km, the share info reverts to miles, but doesn't actually convert the figures!
So if you ran 13.6km, when you go to share the results screen it says 13.6 miles?!
If you actually set units to miles then it works fine though...
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You've found a known bug. Keep an eye on the following thread which has the latest updates from fitbit:
https://community.fitbit.com/t5/Charge-2/Km-turn-into-miles-when-sharing-workout/m-p/2082341#M62901
Best Answer