WP menu click on one category/subcat and directs to homepage

I don’t know how long this has been happening but I just noticed it today.

If you click on the category “getting started” the parent category along with the child categories are not returning the right pages -it just sends me back to the homepage. I removed the links and added it on again but no luck. All the other menu items and their children work fine, it’s just the “getting started” parent and children.

If it has any relevance I’m using WPMU

The site: http://sittersource.org

Thank you in advance.