A family of Microsoft word processing software products for creating web, email, and print documents.
Sorry, that was a misunderstanding:
I meant that I didn't run into problems with other documents, that only had plain text in them. However I had similar problems with other documents that matched the following criteria:
long (>50 pages)
custom style sheets
footnotes
It's easily reproduceable with other documents (I tested 3 different documents from different sources)