You expect to see the next ticket in the queue after you type the nt command for the second time and onwards. However, NextTicket brings up the same ticket each time you enter nt. This article explains how NextTicket sends tickets every time it receives the nt command.
This information applies to both NextTicket Manager for Autotask, ConnectWise, Kaseya, and Syncro.
How the nt command of NextTicket Manager works