Steps Counter on iPhone not syncing calories with MyFitnessPal

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Hi everyone,

This question is aimed at individuals who use/used the step counter that is part of the iPhone & paired it with MFP. Typically my steps are counted into calories lost on MFP, however about 20 minutes ago my calories lost went from 30 to 0. It seems as though the calories were lost? Does anyone have any idea how to get the calorie count back? My steps are still being counted, however the calories are still remaining at 0. Thank you ahead of time for any comments!