Thermal printout only showing lower corner of receipt

Good afternoon,

I have an EPSON TM-m30II thermal printer, and when I click Test Print or print an order, I’m only getting the lower left corner (see below):

I’ve tried all sorts of custom margins (2mm and 5mm), widths (56mm, 74mm, 80mm) and heights (0mm, 10mm, 40mm), but to no avail.

Please advise, thank you.