[SOLVED] Bizarre Page sub-sub-menu bug-- please help!

Hello everyone,

I can't figure out why the sub-sub-menus under my Page Menu Bar have this ugly extra line coming off the top right corner:

http://001e7b6.netsolhost.com/wordpress/

Problem appears in Page Menu Bar under
Programs-->ArtGate and
Programs-->Community Performance

I've checked it with Firebug, but can't tell what's up. Nothing in Atahualpa seems to apply only to sub-sub-menus rather than simply sub-menus, which look fine.

Thanks so much for any help. We're a small non-profit teaching at-risk kids, so we can't afford to hire someone who knows more. (I volunteer).

--jeff