What you show is NOT default.
superadmin has been totally changed, and, you have some Owner group.
Additionally, it looks like your telling groups to not target lower groups.
superadmin:
allow:
1 = atags adminpanel
2 = groups
inherit_from = user
If you're changing groups, inheritance, and can_target, make sure you understand them before doing so by reading our FAQ section.
See our FAQs for making yourself superadmin and factory resetting ULX/ULib.
If you're NOT changing them manually, then you have a gamemode or conflicting addon that is totally breaking the group hierarchy.