Mobile style menu doesn't expand in some resolution

Good Morning all!
in this page:

http://50.87.248.234/~placehx2/

I modified the css to make visible the menu mobile style at bigger resolution (I put 1991px instead 1991px).

But now I have these problems:
Until 979x is all ok, even "Contattaci" is expandible and works correctly
Between 980px and 991px "Contattaci" stops to be expandible and the button doesn't work.
After 991px the button change location and still doesn't work.
Anyway could help me?

Thanks in advance!
Rich

Need help working with responsive div tables...

Hi there,

I'm trying to implement a two column layout using the code here:

http://www.responsivegridsystem.com/

I want three boxes on the left and one on the right. Here is my current work:

https://dl.dropboxusercontent.com/u/33061840/site/responsivedesigntest.html

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