I already got in touch with the customer support directly.
But since there isn't any solution to my problem out there, unless the Withings Developer Team fix it,
I'm hoping to find more people in the Community who eventually have been in the same situation like me and increase the need for a fix.
Here's what happened:
Yesterday I went for a ride with my bike and like any other activity, I wanted my Steel HR Sport to track it.
Since I share my activities with Strava, I started my cycling cctivity by hand.
It should permanently be connected to my Smartphone for additional GPS Data
So eventually I stopped for a lunchbreak and of course I hit the pause button on my watch. After that I went on and resumed the activity, which seemed to work pretty well.
Almost 3 hours later i arrived back home and stopped my cycling activity, only to see that something with my Health Mate App started to look wrong.
Suddenly my App synced the activity over and over again. So at the end of the day I saw my Ride 10 times in a row adding the burned calories to my all day summary again and again!
The worst part is that normally this activity would be shared with Strava. But it does not work in this case anymore. In fact, not even Health Mate displays it on the Online Dashboard in the Web App.
Android version 8.1.0
Steel HR Sport version 6701
Health Mate App version 4.9.1