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power zones

Hi, 
I use rally rs200 and EDGE830 pedals.
For some time now, in the power zones in the GC in zone 7, I have a very low value. In other apps it is ok. differences are 0:45 sec to 3 min in Strava or TP.
After consulting with Garmin, the pedals went back to Garmin for testing.
Do any of you have a similar problem?
In my opinion the problem is in the GC and not in the pedals because other apps on their .fit file show a good value.

The question is if there is an incorrect value in the power zones is it calculating well: load, avr. watts, NP, TSS? I am not sure now that these are good values and they affect many other things