@stromdiddily I just checked the guides on the app, and for HumanGo now I have three workouts: today, 21/09, and 03/10. Between 21/09 and 03/10 there are other workouts that are not synced. Not sure about the logic, nor if the workouts are pulled by Suunto or pushed by HumanGo (the latter I would guess). The good thing is that everything worked so far, every day the correct workout is there for me.
Anyway, if people with wrong dates could send screenshots of both the source app and Suunto app, and logs (and everything in a PM to me), I will open a bug with Suunto, and app developers can check.