Group with higher permission can't do anything to group with lower needed permission?

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Hi! I am having issues for some reason. Recently I made a group as a lower level admin group. This group has its -_client_ban_power set to 50, and the default guest group for the server has the permission i_client_needed_ban_power set to 1. For some reason, the first group can not band the guest... Group with higher permission can't do anything to group with lower needed permission?