Auto-Nav list "shifts" when hovering over it

Permalink
I added an auto-nav to some of my pages, selecting the "beneath a specifc page" option.

This is hard to explain what happens, but when I point to the auto-nav list on the page, it "shifts" and adds extra space beneath the last item, pushing down any blocks below it. Refreshing the page puts it back to normal, then you can repeat the behavior by pointing to it again.

Anybody experiencing this same behavior?

Attached is a short (5 sec) AVI video of the behavior. You can also see it live on this page:http://www.21technologies.com/products-services/lynxeon/...