[Menu] mouseover effect on last item off

hey there,

Somehow the bar under the menu item that appears when i mouseover it is off.
I am not looking for a quick CSS solution because i think it’s a bug.

I checked a few other site’s i found in the forum, and some of them had the problem as well.
Even after i removed all of my own CSS, it still was off.

The problem is caused by layout.css:211:

.html_header_searchicon_disabled #top .main_menu .menu > li:last-child > a .avia-menu-fx {
    left: 7%;
}

I could simply force it to 0, but i’d like to understand why it’s messed up :)