Problem solved.
I went to the church this evening to take my time to find out what was wrong.
The problem was that I have configured tree groups, for driving a speaker set in the baby room, a speaker set in the lobby and the tele loop. For some weird reason, these groups were also mixed to the AUX’es – that was why there always was some signal to the AUX’es. Turning those mixes off solved the issue.
Great mixer.
Thanks for your support.
Jørgen