Menu/submenu issue

Hi, I'm having a strange issue with my menu structure. When I click on a submenu, the parent page is being dropped off the main menu for some reason. This is only happening on one page. my site is www.ctmasterclosets.com If you click on "Details" then "Colors" you will see what I mean. It works fine in page edit mode, but on live site it gets messed up. Please advise on a fix. Thank you.