Quote Originally Posted by zoni View Post
So. There is 2 teams. Both of them has same amount of points 15. Team 1 who is leading has +21 goal difference (23-4) Team 2 who is second has +25 (28-3). First Match between them was 1-0 to Team 1. Second was 3-2 to Team 2. So, why Team 2 is not leading? Can someone explain that? Or is it a Bug?
No, this is not a bug, it’s not necessarily goal difference that decides who wins the group, in this case, it was head to head which determined who topped the group.

As you stated, Team one won 1-0 and then lost 3-2 to team two.

This would give an aggregate score of 3-3, team one goes ahead of team two because they scored more away goals during the two games than team one.