Problem with my referrals

[Radulfr]

I invited about 10 friends to play top eleven football manager and they all are now playing the game through my invitation. Yet only 3 of them are with me in the same server and 4 are marked as my referrals and it's not the same 3 people. how is this possible?
the majority of my friends are in one server and me and 2 others are alone. can't you put us together or something?

PS: they did accept the invitation within a week.