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955 register wrong pulse zones

I have some challenges with my new 955 Solar running latest 11.12 firmware. I have configured my pulse zones based on bpm for both running and general activities (in mobile app) and when I verify in the watch, it’s the same configuration. 
But when I go out running the watch register different values for the zones. 
example: I have my zone2 configured between 133-154 but when I look in the watch during the session (also confirmed later by the data) the watch register zone2 between 114-132. 
this results in that the data is registered wrongly. 

anyone else seen this or have any suggestions on how to fix it?

 Thanks