blank spaces show up as 'S'?

When I print a PDF I have created in LO, why do blank spaces print as ‘S’?
It looks fine in LO. It looks fine in the PDF veiwer, but it prints weird. Please help

How do you “print” a file you created in LibO?

By File > Export to pdf?

By using a seperate pdf-Writer? If so which one?

Which pdf-viewer are you using?

Can you provide the steps to reproduce this behavior? (Exact ones, with software names and everything)