My brother has two teams on the same level and server as one of my teams. All three have been in the same league and Champions League every season (6). The only thing you can control is that neither you nor any of your friends should have any other friends on that level and server because that could cause problems. If your friend has two other friends and those friends have other friends then Nordeus cannot fit everyone in the league of 14 teams. So tell your friends to remove any other friends and do not accept any friends requests. Again, I don't know if you guys have any but if you do, that could be the reason for it..