IE8 and menu problem

Hi, I'm having a problem with IE: menu became vertical but only in Jomsocial or Profile page. In first page and other browser no problems.

My site: www.listabeppegrillo.it/index.php (I have a redirect in index.html)

Here the problem: http://www.listabeppegrillo.it/index.ph ... e&Itemid=2

Test user: test/test

I found , but i was not able to solve.