Why are there multiple instances of the Printer installed?

For Windows the same device plugged into different USB ports on the computer represents a new device. The device is installed again and again once for each and every USB port the device is plugged in.
You need to have one installation of the printer and the printer name MUST be; EPSON TM-C3500

Possibly fixes

Disconnect printer (remove from USB port), and delete all copies of the printer. Then reconnect the printer. This should install a new copy of the printer correctly named.