Problem with duplication home page

My site is: www.tregima.it
and I put static content such as home, but I created an entry with this url: www.tregima.it/mobili,-furniture : kitchen, living-, bed-rooms-by-tregima!. html
that always points to the home and so I create a duplicate content.
How do I fix this?
Thanks

I think you haven't copied that URL correctly. Can you point me to the page on your site where it's generated?

I think you haven't copied that URL correctly. Can you point me to the page on your site where it's generated?

ops:
www.tregima.it
www.tregima.it/mobili,-arredamento:-cuci...-letto-tregima!.html

I solved it by creating an alias, there is no other way?
could not do it automatically?

I would have to take a look on your settings. Also turn on debug to see why it's 404.

I would have to take a look on your settings.

Here's the screenshot with the settings, be it good or you want more?...
img51.imageshack.us/i/ishot1.jpg/