Epson wf-7310 turn off double sided printing

Dorico
1

Hi, probably not a Dorico issue, but I don’t have this problem in other software (e.g. Excel).
Even though I select “print on one side only” my printing comes out double-sided (epson wf-7310)
Has anyone had/fixed this problem?
Edit: on Mac

Thanks.

2

A bit more information - the same file with the same Dorico print settings prints fine single sided.

3