Need to re-tag some Para styles of imported Word docs

I'm hoping someone can help. I have a fairly modest-sized help system that is created from imported Word Docs (Office Word 2003). These documents use conventional paragraph styles (Heading 1, Heading 2, etc.).

In my RoboHelp X5 project, I've created a custom CSS file that I apply to the imported Word docs. After importing any of the docs, some of my paragraph styles become misaligned: for example, my Heading 3 paragraphs are flush with the left margin, rather than indented as they should. When I click inside the mis-aligned paragraph, I see that the paragraph is indeed tagged as Heading 3. At fist I thought it might have been my CSS file style definitions, but they appear to be fine. In fact, all I have to do to correct the paragraph alignment is to reassert the tag (ie From the RB Project window, click the para (the fomating combo box reads Heading 3), reselect (reapply) the style (Heading 3), and then select "Reapply formatting  of the style to the selection" from the Update/Reapply Style dialog. RH then correctly applies the alignment defined for the style in my CSS. Note, this appears only to be an alignment issue; the fonts and other attributes always seem to work on import. Unfortunately, I have to do this hundreds of times because I seem to have several styles that need retagging after import.

Any ideas? I downloaded a trial copy of RB 8, hoping this was peculiar to X5, but RB8 behaved the same way.  If it's any help, I've pasted the HTML coding for a Heading 3 paragraph, 1) just after import 2) the para after Heading 3 style was reasserted. For some reason RH is "margin left" and "text-indent" attributes.

1) Immediately after import

<h3 style=

"margin-left: 40.3pt; text-indent: -40.3pt;">2.2.1<span style="font: 7.0pt 'Times New Roman';">     

2) After retagging as heading Heading 3

<h3>

2.2.1<span style="font: 7.0pt 'Times New Roman';">     </span>Using the Stylus</h3>

Thanks.....rob