When moving a ticket to another service desk queue and the category is not set the ticket does not show up in the service desk ticket list view.
Workaround - Set the category for each service desk ticket before moving to another queue.
If a ticket is moved and the ticket number is known but cannot be found in any service desk view. Click on any other service desk ticket, then substitute the ticket number in the URL to match the missing ticket number. At this time the ticket can be edited as needed.
The format of the URL should be as follows: K1000HostName/adminui/ticket.php?ID=
NOTE: Notice the URL in the above screenshot. Make sure when searching for a ticket that adminui is in the URL.