It is impossible to tell anything from those images. The problem could be due to the use of: a 'different first page' and/or 'different odd and even' page layout (you evidently have at least one of those), with a Section lacking the appropriate StyleRef field in one of the headers; an empty paragraph in the Heading 1 Style, resulting in the StyleRef field having nothing to display; or other formatting issues not apparent in the images.

For a definitive answer, you would need to attach the actual document to a post with some representative data (delete anything sensitive). You can do so via the paperclip symbol on the 'Go Advanced' tab at the bottom of this screen.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]