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Thanks Ryan, it turns out that site along with others are using proxies to copy our content in a negative campaign. Will put into action what you said.

Anytime! And you should be ok with Google. Our product team is developing a feature to ignore certain parameters in crawl diagnostics so hopefully this will help for most e-commerce sites once it's available.

Can you show some of the code that the sitemap displays? I would think the tags have to exist on the page somewhere, in order for the sitemap to be pulling them in. Could it possibly be from a sidebar or module position header that is rendering the same H tags? Try running the different pages in SEO Browser, to see if the pages physically are the same. After entering your URL, click simple: http://seo-browser.com/