Do you have the Garmin set to “Smart Recording” or “Auto Pause”? Im told this can cause havoc with Training Peaks.
I’m assuming that your FTP setting is the same across platforms.
I had a similar issue lately where not only sync’d data but individual uploads of the data that Training Peaks, as well as Intervals.icu would report a higher TSS value than my Edge 530. In cases the TSS was ~250 for a 90 minute tempo ride. Certainly not what dozens of similar rides had oroduced in the past.
If I loaded the data into Golden Cheetah the data Garmin reported was the same as Golden Cheetah.
If you have Golden Cheetah on a PC try loading the data there.
In my case I had replaced the Garmin Edge and the problem went away; much like a Bigfoot in the woods of Quebec when you put up a trail cam. I cannot explain it.
Do you have a “spare” Garmin or one you can borrow from a friend and ride 9 Hamners again (Bonus session!!!) to try?
that could be it. I had the auto pause turned on for the half monty (I usually never stop). I forgot to switch it back.
I stopped for about 10 seconds, just after the 7th hammer, and then two more 10 second stops on the 9th hammer. My legs were shaking when I got off the bike - hence I want credit for it
I’ll turn it back off and see if it happens again.