Group ride turn into solo rides

I run Zwift on Apple TV. Recently (last 10 days) most of my group rides (TDZ Stg 5 and Stg 6) have turned in to solo rides. I know there are others on the ride. But I don’t see any of them.

I always check for any updates before I start Zwift. So issue can’t be that.

Can anyone suggest a solution to this problem?