Sense? Vs charge2 vs ionic

[Viking80]

So I got a sense as part of the ionic recall.. I have had a charge 2 then  upgraded to ionic, when I swapped from charge 2 to ionic I did not notice  much change in  cardio fitness score and heart rate monitoring. Since getting the sense my cardio score is dropping like a stone and my zone times are loads less. So my question is .. were my 2 previous fitbits wrong or is the sense wrong. I have done all the reboot, disconnected etc. And no change.

[SunsetRunner]

No, the Sense HR monitor is horrible. Fitbit knows about the issue, but haven’t come up with a fix. 

I miss my ionic!!

[Viking80]

Seems odd to me. As yesterday I ran which I don't do very often and my heart rate hit 185 on sense. But when I cycle I hardly get any zones. This is also reflected in the strava app as relative efforts have gone down 3 fold when cycling