Thanks for identifying potential printing issues.
I've updated the TINGAP-PNPCards.pdf file with the following changes.
- Centered the page content to correct possible margin issues.
- Added crop and registration marks to aid alignment.
- Rotated the card backs so that they flip along the short edge of the page for double-sided printing instead of the long edge to aid alignment. Duplex printing is not recommended for correct alignment.
Hopefully this will help with your issues and thanks for your support!