Me again

I'm using davilacs sitemap for a while, which holds all boards and topics as 1.html, etc.
After installing seo4smf the inline links did not show proper.
The link to an topic now look like this:
www.mysite.com/forum/sitename/-t44556.0.html
What about Google, because Google already caches the wrong URL instead of the beauty ones from seo4smf?
Could it be, that the URL's from seo4smf are rated as duplicated content?
Regards
Sven