Word 2013 overrides paper size in print to PDF

I have found that I can get a better-quality PDF from Word when I print to PDF than when I save as a PDF within Word, but for some reason, when I try to print to PDF in A4 format, Word seems to override my choice and make it an 8.5x11.  If I choose legal size instead, Word gives me what I wanted.

I've already:
* Ensured that the paper size for the entire document is properly set as A4 (and if I save to PDF, that's what Word produces).
* Looked at the paper size that shows up under "settings" when I go to print, and it shows A4.
* Manually selected A4 in the printer settings, which for some reason still start with letter-size by default.

Nothing works.  I even tried installing a new print-to-PDF plugin but it didn't make a difference.

What do I need to do to fix this?  It's not a problem I had with Office 2010, and given how crucial it is for me to be able to produce A4 documents, I may have to uninstall Office 2013 and go back to 2010 if I can't resolve this.