Epson RX585

Using Greetings Card Deluxe to print Avery J8563 (14 labels per sheet) the results do not line up. The 'offered' range in the app suggests Avery 5962 or 5662, neither of which appear available in UK. Is the App US based? I have tried changing printer o/p to 'Letter'.
Any ideas on how I can get the printer to cooperate?!

Printer: Epson Photo RX585
O/S Windows 7
Greetings card Deluxe

Epson RX585