PDFs are shrinking when saved from remote source.

Over the past couple of months, I've noticed that my PDFs are not being saved at the proper size and are being shrunk.

I've been working with a few different web sites over the past year... generating checks, receiving invoices, etc. and when I would print them as  PDF, Acrobat DC would open them, and the documents were displayed to fill the page at 100%.

Recently, I've noticed some changes in the PDF documents.

The web sites would generate the documents as usual, I would print them to PDFs, so they would be saved,  and when I printed them to paper from Acrobat, the documents were smaller than 100%.

As I've recently noticed, when I save the documents from the web sites I use, I notice a lot of white space on the right side of the page. Not sure what is causing this.

I haven't changed my process, and I doubt that the other web sites changed their software.

So I am thinking there is a problem with Acrobat.

Any and all help would be appreciated.

Thanks.