Are there any Garmin Vivofit Users out there?

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Hello!

I've been using the Vivofit (similar to the Fitbit) for 10 weeks now. It tracks my steps, miles, calories and syncs with MFP. It also gives me calorie credit for the exercise I do which get transferred to MFP.

Lately I've seen a big discrepancy (sometimes over 100 calorie difference) in unused calories between the Garmin site and MFP. Has anyone else had this happen? Any help is explaining what is going on would be greatly appreciated!

Thank you!