Hi, first there was the Today problem after updating, e.g. not showing the new Today screen which makes it possible to choose seven activities it should monitor, now you have this problem. Maybe the same solution will work as for the Today screen, e.g.: put your Versa in the charger and connect it to PC and leave it their resting for about 2 to 3 hours and see whether your problem is solved after this time. Really hope this cause there are a lot of problems mentioned regarding notifications and iPhones, even the by Fitbit supported ones.
