Hi mk14steve, I believe you have the same problem as discussed in: “Garbled Text when Compiling using Manuscript (Courier)” - https://forum.literatureandlatte.com/t/garbled-text-when-compiling-using-manuscript-courier/93656/1
The following might help you too:
If you are using Courier Prime, try removing(move into a different folder) the system Courier Prime fonts from the Windows/Fonts folder. Scrivener comes with Courier Prime in its installation folder. Restart Scrivener and recompile again. Hopefully the PDF contents will be as expected this time.
If this helps install the Courier Prime fonts from the Scrivener installation folder, although this is not needed. Do this only if you need Courier Prime in other applications too.