The Alpe Dash by Herd Racing League Today 13:15 Road to Sky km

I completed The Alpe Dash by Herd Racing League
today, 1/31/2021 @13:15**
Road to Sky.

The Zwift shows my time 1:43:06 but the Zwift Power shows 1:53:06. Why there is discrepancy?

I checked about half the Cat D’s - they are all 10 mins difference too. Sorry, I dont have the answer but thats odd.

EDIT: Just seen that they stagger the starts by 10minutes between Categories (e.g. A’s leave 40mins after E) so the theory is everyone finishes roughly at the same time. The start time will be when the Cat E folks left that you are seeing in ZP, whereas Companion App is sowing your actual time.