Same problem. There is another thread with a few people having the same issue.
For me, last night I completed Alpe du Zwift for the first time. Earned a bunch of drops, the achievement for Tour of Ice and Fire and the KOM Gloves. When I finished the ride, the gloves and the achievement were gone and I had less drops than when I started.
On Apple TV 4k and using companion app on iOS - all latest OS and app software installed.
I started a help/tech support ticket. Hopefully I hear back and this can be fixed.