If you view the source of the page you see the links are still there for all menu items so it must be something in the artisteer css doing that. From checking with inspect element in Chrome I found it is caused by:
#art-main { ..... overflow:hidden; }
You could try adding
.art-content { min-height: 600px; }
to make the center content section have a minimum height
in style-artisteeroverrides.css you may need to tweak it to make it tall enough to not clip the menu
Hope that helps,
Joe