Hello

I hit the another wall.
Try to click about us menu from the home page.
http://skwebyuks.byethost11.com/joomla3/index.php

i can't click it. if i hover to other menus and come back to about us page, i can click it.
from the home page, hover to about us, doesn't show the link, but if hover to the other menus and hover back to about us menu, the link is there.
what is the cause and how can I fix it??