Why does SEOMoz think I have duplicate content?

[jsillay]

The SEOmoz crawl report shows me a large amount of duplicate content sites. Our site is built on a CMS that creates the link we want it to be but also automatically creates it's own longer version of the link (e.g. http://www.federalnational.com/About/tabid/82/Default.aspx and http://www.federalnational.com/about.aspx). We set the site up so that there are automatic redirects for our site.

Google Webmaster does not see these pages as duplicate pages. Why does SEOmoz consider them duplicate content? Is there a way to weed this out so that the crawl report becomes more meaningful?

Thanks!

[jsillay]

Thanks so much, John. I appreciate your prompt and thorough response.

I guess I need to check why the redirects are not working the way they are supposed to. However, Google Webmaster does seem to see them because they do not flag duplicate titles etc.

I am not sure what you mean with the comment on the active class. Would you mind explaining that?

Thanks!

[john4math]

These are duplicate pages.  I'm not seeing a redirect from http://www.federalnational.com/About/tabid/82/Default.aspx to http://www.federalnational.com/about.aspx, nor is there a canonical tag telling the bot that http://www.federalnational.com/about.aspx is the canonical version.

Ideally, the platform could 301 redirect the first URL to the second.  Failing that, you could place a canonical tag in the header of the page to point to the /about.aspx page.

Not relevant to the question but I also noticed in the automatically created version of the page, the active class isn't getting set on the <a>for "About" properly so it's not getting highlighted in the header.</a>