Portfolio Paginate not works

Hi,
I have an issue with my portfolio.
I have severals items and I created a new portfolio page, I set this in the Theme Options> portfolio options and I add the porfolio element.

Now in the page, I can see the filter and the pages numbering but, if I click on the different pages numbers (1,2,3,4) nothing happen.
The URL change with the next number like page/2/ or page/3/ but the items they not changed.
If I change the number of items in the module, they changed but the paginate still do not work.

Can you help me please?