RH reverts to default styles when I compile help system, instead of using designated custom styles

I have created a custom template in RH9 running on Windows XP, patched to most recent update. The template includes a number of custom styles - we aren't using any of the default RH styles. In the RH authoring environment it looks great, but when I compile the help system, it seems to revert to the default RH pargraph styles.

How can I resolve this issue?

Thanks in advance,

Douglas