Sounds to me like the person who created the PDF did not embed the fonts, and have used a font you do not have on your computer. Can you recognise the font they have used? If so, install it on your computer and the PDF may print OK.
Are these PDFs accessible to the public? If so, why not give a link to one of the ones causing you problems, and I will see what happens when I try and print it. That could narrow down the problem to being either the PDF itself or your computer.
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