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Garmin 955 with HRM pro power issues

I'm running with a Garmin 955 and a hrm pro. My average pace is around 5:35min/km. My weight: +- 71kg. After doing a lab test someone told me that my power values are way off. Garmin records always an average of 315w for this pace while for my lab test I should run a lot faster If I run with that power. 

Does anybody also have issues withe the Garmin power?