I can't duplicate the problem you describe. When I open your sheet (I can't let it recalculate because of the missing Excel files) and save it as pdf, I get a pdf which looks quite OK. I attach it here.
But I remember that other user as well reported about problems with the built-in pdf export here in the forum and the workaround usually was to use a different pdf printer like AdobePDF, Microsoft Print to PDF, CutePDF or others. So you may give it a try with a third party pdf printer.
EDIT: Haven't seen the other replies when I started mine.
As you write that you used "Microsoft Print to PDF" I also tried and the resulting pdf was quite OK, too. is was a lot larger, So maybe the built-in pdf export does not include all fonts used - just a guess.