In my case this is happening with a Versa tracker, Samsung Galaxy S8+ phone, Android App v2.72.1 (2193280). This problem seems to affect Fitbit Versa and Ionic trackers, as reported by other users, at least on the App for android. There is a post on the community to talk about it:
https://community.fitbit.com/t5/Ionic/Calories-displayed-as-quot-quot-for-exercises-in-Android-app/t...
, but this is the first Feature Suggestion. This has been happening since April 2017. I feel insulted that Fitbit hasn't fixed it yet, for their most popular and new trackers.
Basically, within the Exercise log (accessed by tapping on the Exercise icon) in the App for Android, the lines corresponding to certain activities do not show calories; instead they show "-- calories". Also attached to this bug is the fact that activities that have this problem of not showing calories and don't normally log/show steps/distance, now do. For example I'm seeing no calories displayed my Cardio Sculpt or Yoga classes, but distance is displayed. This never happened until I switched from Charge 2 to Versa. It seems to mostly affect Weights, Workout and Bootcamp modes. Which is ridiculous, because they are not distance based activities.
Finally, if you try to chance the activity type in the Workout mode, the app fatally crashes. The activity type can be changed from the Fitbit.com website log, but after syncing, the wrong stats still display. Refer to:
https://community.fitbit.com/t5/Ionic/Cannot-edit-workout-in-app-Android-7-0/td-p/2407173
All these problems appeared from the get go, when I switched from Charge 2 to Versa.
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