There is no concept of "Operator" in osTicket. There are Users (who can open their own tickets), and Agents (who can open tickets for Users). Your concept of operator could be either a User opening a ticket for themselves, or an Agent who has opened a ticket for a User. You haven't shared your settings with us, nor indicated if it was a User or an Agent opening the ticket. I'm not sure that anyone could help you with out more information (settings) etc.