[CutX]

don't forget to destroy the label when they go off duty OR disconnect while on duty.
when they go off duty OR disconnect while on duty,

also, just sayin' this if you din't do that:

you also must set the PlayerInfo[playerid][AdminDuty] to false.

if, lets say playerid 14 is onduty and crashes while being onduty and a new player connects with the playerid 14,
he'd be on duty cuz you didn't set the enum to false in onplayerdisconnect

but well, i can't tell if you did that or not, since you didn't show us the command yet :/