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Weird HR readings with HRM Pro

Another run with my FR955 and Coros Pace 2 - both connected via ANT+ to HRM Pro.

While FR955 reported my HR correctly, Coros definetly didn't - the graph looks choppy.

Below are links to the same activity (there is no option to make an activity public in Coros).

https://t.coros.com/activity-detail?labelId=447801277320036353&sportType=100

https://connect.garmin.com/modern/activity/9958812232

This is what my Pace 2 recorded:

Anyone else experienced anything like this?

Any ideas how to resolve this?

Connecting via BLE to Coros doesn't help.

This happens only when using my HRM Pro, Polar H10 and OH1 don't have this problem when connected with Pace 2.