Duplicate Content on WordPress Site

Hey folks,

I am seeing a whole lot of duplicate pages on my wordpress site and I don’t know why.

A single blog post will end up creating several pages. For example:

http://screencast.com/t/0w4jelU8mLN

I am going to check out some of the duplicate content plugins that are available, but I not sure if this will resolve the issue or not.

Just looking for some feed back on why this happens, if it will cause seo issues, and recommended solutions.

Thanks!