I've been told that /invisable for lv 10 is bugged. When for example MagicTouch is ID.5, and he does /invisable, then ID.5 will never show an admin, like myself who gets that ID. So when using /invisable their ID can't be used again by an admin, because it won't show up on /admins.

Something wrong. Like Example if Lvl10 and do /invisible and ID.5 and quit without do /unhide so when anyother admin come with that ID.5 That Admin name not shows in /admins it mean it still active on that ID. if lvl10 do /unhide before quit then its fine