I use RH HTML. When I import a word doc that I haven't written, I sometimes find, after import, that some Word headings have been created in RH as bookmarks within a topic, rather than as separate html files. The TOC has been created correctly but these spurious topics link to bookmarks rather than to single html files.
My workaround is to cut the offending sections from the Word doc, paste into Notepad, then re-insert this unformatted text back in the Word doc. Apply the necessary styles, then import to RH. This solves the problem, but it is time-consuming and I wondered whether anyone recognised the problem and had an easier solution.