Duplicate Listing URLs (SEO problem)

I noticed a big issue with lots of duplicate listings. As you can see at URL examples below, all these URLs are belong to the same listing. You can type anything you want and it’s still retuning the same page.

Click one by one and see the results in browser:
http://general.demoflynax.com/united...-accent-2.html
http://general.demoflynax.com/united...1231231-2.html
http://general.demoflynax.com/united...-see-it-2.html

Instead of returning 201 for the same listing; the system should serve 404 Page or 301 Redirect in case listing title was changed by user.


P.S. Google panda is watching us, so better safe than sorry.

and if you navigate to:
http://general.demoflynax.com/united...e-right-1.html
you get 'Apple In-Ear Headphones with Remote and Mic' with 'jewelry-and-watches/earrings/' in url..