Tag structure offset by page breaks when creating PDFs from Word?

I am trying to create PDF/A-1a compliant PDFs from .docx files using the PDFMaker in Word 2010. I'm not the creator of the files, they're sent to me by authors for layout editing and conversion into HTML and PDF. I'm applying Word styles to the document for a number of reasons, one of which is that it allows me to customize the labels of the PDF accessibility tags.

Here is the problem I'm having: When a paragraph spans a page break in Word, the style that I apply to the paragraph only applies to the section of the paragraph before the page break. The remainder of the paragraph on the new page is assigned the Normal paragraph style. This, in turn, throws off the tags for the rest of the document, moving the all tag labels down one element.

Does anyone know how to keep this from happening? Or how to fix it apart from going through and manually changing all the tag labels so they correspond to the elements I'd like them to?

TIA!