Menu subcategory links to parent

I have an auto store built on Opencart.

For some of the sub-menu's, like hoverboards for example, they're all in one subcategory under "Exterior", but when I click on that, the site goes to the parent menu link, even though the products show up when you search for it (http://www.autohouseexpress.com/index.p ... arch=hover)

This is happening across several sub categories, any idea on how I can fix it will be appreciated.

Thanks.