Very strange. It should be showing 2 cores, 4 threads for the 560m. Try downloading something like Speedfan to see if it will ID all of the cores/threads. Otherwise, I'd get in touch with the laptop manufacturer to see what the deal is.
Edit: Here are intel's specs on it:
http
/ark.intel.com/Product.aspx?id=49653
And here is a link to how it should look on CPU Z:
http

/pcgamingcorner.com/wordpress/wp-content/uploads/2010/11/CPUZ.png