Other troubleshooting steps:
Pick another ethernet kitchen printer that is working. Go into Setup-Hardware devices and change the IP Address of the printer that is not working to the IP of a printer that is working. Restart the orderserver.
If 2 chits print on the printer that was working, then the onePOS setup is working correctly and there is a hardware problem.
If only 1 chit prints on the printer that was working, then there is a setup problem in Setup-Hardware devices.
This should help isolate where the problem lies.