Amazingly I have the same problem on 2 different HP printers networked to Windows 10 Pro 64-bit.
Printing a PDF of a Word table with invisible gridlines, and characters at 10 points, I first have some arial characters, a tab, then I switch to TNR in the same cell
About 15% of the time, the printers incorrectly keep printing Arial. Most of the time the printers DO switch correctly.
Printing text at 12 points not in a table, the HP printers seem to never fail to correctly switch FONTS.
Printing footnotes at 8 or 10 points, the HP printers seem to never fail. However, these lines start out with TNR, switch to arial, then back without any tabs.
And when I send the PDF off to KDP, the printed book comes back correct.
Obviously I could do more experimenting to pin this down, but hoped somebody had a fix.
Printing a PDF of a Word table with invisible gridlines, and characters at 10 points, I first have some arial characters, a tab, then I switch to TNR in the same cell
About 15% of the time, the printers incorrectly keep printing Arial. Most of the time the printers DO switch correctly.
Printing text at 12 points not in a table, the HP printers seem to never fail to correctly switch FONTS.
Printing footnotes at 8 or 10 points, the HP printers seem to never fail. However, these lines start out with TNR, switch to arial, then back without any tabs.
And when I send the PDF off to KDP, the printed book comes back correct.
Obviously I could do more experimenting to pin this down, but hoped somebody had a fix.