Did you really not have the spinning wheel on your screen, just after going through the arch at the top of the Alpe? It’s only visible for maybe 5 seconds or so, and after the exertion and in the excitement, it could be easy to miss. Here’s a recent example:
From your activities, we can see that you did get some gloves for hitting level 14 (nice one, by the way).
You may have also won gloves at the top of the Alpe. The Alpe gloves are unique, with distinctive red polka dots on the backs. If I were you, I’d have a root around in your avatar’s choices of gloves in game to see if you don’t have these, along with the others.
If you really didn’t get the spinning wheel or one of its rewards, it’s time to bust out a trouble ticket with Zwift.
EDIT: The Alpe gloves have red polka dots like the Tour de France mountain jersey, not checkered red/white like I originally wrote. In your garage/asset locker, they are just labelled ‘Zwift’, so there’s no indication that they come from summiting the AdZ.