Issue with PDF printing

I've been using Aspose PDF .NET for a couple of years now and only recently have this issue.

My web app takes a pdf from another location and merges it with a pdf template I have then saves it and emails it.

The template pdf was recently updated by a designer, it looks great but people are having issues printing the pdf. For some people it shows as a tiny 1" thumbnail on their printer. For others it shows enormous where only the top left couple of inches takes up the whole page. This can be seen in the print dialog as well. Some people are able to use a setting like "fit to page" to get it to work but some cannot. I've been using this method with a different pdf template for over 10 years with no problems.

I feel like it has to be this new template but the designer seems to forget how to speak English any time I bring it up. She's not going to fix it so I need to.

When I open the PDF in Photoshop it shows the pixel resolution as 3000x2282, it's landscape so that makes sense. If I switch it to inches it says 41x31" which is obviously a problem. I've changed that to 10x8" several times but the next time I open the PDF in photoshop it's back to these settings.

Are there any other settings that should affect this?

Is there a way to change the Print DPI and/or page size in inches for the pdf in Aspose PDF?

Even a tool that could permanently change those properties in the pdf template would probably work.

Thanks for any help, or suggestions