Issue with Non-Accessible Drop Down Menu

There is an issue with the dropdown menu with my theme....you can't get to the second menu level from the first drop down.

There is a gap between the lists and you can';t get from one to the other - so a lot of my site is inaccessible to visitors!

http://www.publicaffairs.com.au/career-centre/seeking-jobs - it is the Seeking Jobs page you can't get to from the main menu.

Can someone please check and advise.

Thanks.
Karen