Operators are removed from Operator group
Hello,
We have a new operator group folder which contains a new operator group. When I (as an admin) add new operators to the group some of us disappear from the group automatically. I've tried to add 3 different users. All with the same rights/accesses, but two of them always gets removed. The last one is still there. I can't find any differences in the operators.

Do you know what the issue might be? Is there a OOTB-workflow that cleanses the groups for some reason? Im out of ideas.
Need to add: The ones I add that gets removed doesnt get removed instantly, sometimes they are there for 5 minutes, sometimes 2 minutes etc.