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Fitbit properly recorded over 22000 steps today and then about 11 tonight after syncing, it showed only 8103 steps. Also took away steps from yesterday. Think app of "My Fitness Sync" erased the steps because wasn't wearing Apple Watch during race.
Ouch! That sucks 😬 You're probably correct about multiple device synchronization overwriting steps, I've also encountered this problem. When Fitbit has two sets of data for the same time, they tend to use the one with the least steps. You can recover your steps with this link: https://www.fitbit.com/activities, but they won't count in challenges. Make sure to sync one device at a time or only use My Fitness Sync" when not using your One. Cheers!
