Fenix 7 pro version 16.22 heart rate Data not correct

Hi since updating to 16.22 about a week ago ive had issues with the heart rate data being wrong. Ive juat done a 15mile ride on my mountain bike and i know i was pushing but my heart rate was no where near what i expected to see. Also the recovery time is 0hours. This has been the case for the past 3 activities. 
is this an issue with the SW update ?? 
Thanks Darren.