On my server anyone can add himself to channel admin and edit channel name + password, help pls!
Check what group member add and remove they have, whether they are getting it from a server group or what ever. Member add power that comes from server groups can be used to assign any form of group anywhere. Member add power that comes from channel groups will let someone assign channel groups to people with the level of add power they have in any channel where they have that channel group and then they can assign server groups up to that level of required add power anywhere on the server.
don’t forget to check the member_add_power of the guest channel group as well, that too needs to be lower than the needed_member_add_power of any other group (both channel and server)