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My heart rate shows as a flat line in Garmin Connect, but it isn't on my watch

Hi, outside activities my heart rate is shown as a flat line in Garmin Connect. On my watch I see much more variation in it. So my sensor is still working, but it is not shown correct in the app. Any suggestions? Has it to do with smart data, beacuse I've not changed the settings and before it was correct (2nd photo).

Br, Sander