Extra fm-ditafile tag is generated in book file after generating FM

I'm using Adobe FrameMaker 8 in Tech Comm Suite 1 in Windows XP.

When we generated our book files from ditamaps, we seem to be getting an extra fm-ditafile tag in each chapter.  We have been unwrapping these extra tags, but then we have to reapply all of the headings.  For example, by removing the extra tag, the first heading automatically becomes Heading 1, but retains the formatting for Heading 2.  Heading 2's must be made Heading 3's and so on.

While this works, it's a very manual process.  Is there any way to eliminate that extra fm-ditafile tag or to easily reapply all of the headings?

Thanks.