[Himmelswüst]

I'm experiencing an odd problem with a multi-page document of instructions I'm currently formatting.

The document consists of several sections and subsections, and I have created styles for section headers of different levels and the body text. The body text has a margin that is about half a page because I want the right half of the page to be available for inserting graphics such as screenshots. I have not formated this using the page margins because I want the section headers to be able to run across the entire breadth of the page.

Now, inexplicably, on some pages the last line of the text runs across the entire breadth of the page as well -- while the body text of the same paragraph continues as formated at the top of the next page.

Does anyone have an idea what the problem might be?