Let's assume you use Foxit reader to print a pdf. And the pdf has such a width that it doesn't fit on the page if printed at 100%. And you didn't scale it to a size that fits, say 75%. That could be a possible explanation.

Or maybe you installed the wrong driver.

Or maybe it's just gone south.

As you can imagine, these three different situations need a different correction. And then there still other options.

Kees