For about the last week we have been seeing tickets randomly show the "Ticket Created from Thread Entry" record in some tickets.  It is showing an actual ticket number that does indeed exist but it wasn't created by any of the technicians.  In fact it shows the "System" user did this.  I found an old support forum thread in the OSTicket website where ntozier mentioned that the "System" account shouldn't be allowed / be doing this and only technicians can created new tickets from existing threads, so I am not too sure what is going on there ( https://forum.osticket.com/d/93677-ticket-created-from-thread-entry).  Like I said, it just started happening for the last 5 or so days I would say and we have been on the same version of OSTicket for a few months now and no configuration changes have taken place either.