navigation isn't working

Hi,
my site is this:
http://esgrimascaramouche.com/
I am having problems with the menu. If i open the site for the first time in a pc the buttons don’t work properly, because it refresh the home page of the site but not the one I want to go. And I try it on an Ipad and happened the same.
Why that could be? Is there a code to solve it?

Thank you,
Steff