DNP QW410 4x6 wrong prints paper size

[tapeo]

I have problems with a DNP QW-410.

I installed CUPS via ubuntu (22.04) apt and then installed Gutenprint 5.3.4 compiling it. Then I setup the printer via CUPS web interface correctly by selecting the gutenprint driver and selecting the 4x6 paper.

I added the printer successfully through Ubuntu settings but when I try to print a 4x6 picture (the one that comes from DNP as test picture), the printer prints not a 4x6 but a 4x4 I think (see attachments).

I tried the last two days by tweaking the original PPD related to the QW-410 but all the attempts print wrong image sizes, printing squared pictures or not borderless as it should be the picture.

Can anyone help with that?

Thanks!

Ubuntu 22.04
CUPS version 2.4.1