Thank you so much, that did indeed fix it. I've been pulling my hair out over this and of course, the fix is relatively simple. I really appreciate your help!
I downloaded CutePDF and 'printed' the file to that, rather than using the PDF export. I'm afraid the measure number issue still occurred.
When I'm exporting the PDF I go to File>Export>PDF and do it that way. Here's the edit number region panel, along with the position subpanel. I also attached the first three pages of my ...