When I convert to PDF, Frame moves a section onto a previous page

I have a chapter where I used Keep with Next on the Pagination tab to keep some information together, which moved it onto the next page in FrameMaker. Everytime I create a PDF of the document, though, that information is being moved BACK to the previous page and I wind up with a blank page at the end of the chapter. In frustration, I finally put FrameMaker into two page mode and PDF'd only that file, and watched in disbelief as the PDF process, right in front of my eyes, moved that information I'd wanted on the next page onto the previous page in FrameMaker before completing the PDF, then put it back on the next page!

I'm going to use Insert Page Break as a work around, but I'd like to know what is going on here.

Pertinents:

Windows 7, fully patched

FrameMaker 2019, fully patched (as far as I know)