Same-quality league?

[BridgeGoth]

I just looked another level 9 team that was much lower quality. His league all the teams are of similar low quality, while my team is in with all 5 star teams.

One of my RL friends who is level 7, her team is in with a wide range of teams, from 1 star to low 5 star. Her team has 5 League and 4 CL wins, so she has been very successful.

I think her team average was like 49.8 or something at the start of the season, so just a tiny bid under 5 star. Mine was just over 60. Is it possible they are putting the 5 star teams in their own leagues?

To add to the oddity.. of the 14 teams in my league.... 1 finished 2nd, 1 5th, 1 7th, the rest didn't qualify. I was the only league winner.
So how are teams which are all higher quality than me and all 5 star players all failing?