Sunnto Run HR reads too high

[zagazoo]

Hi
Really like so much about my new Sunnto Run but reviews suggested HR was much better than previous models.
What I see it reads really high - much higher than my max heart rate of 170 (i’m 58) - it seems latest firmware update has not improved at all.
Here is example - I also saw much more stable results on my Garmin FR 55 (more like 140-150 for a run like this)