When Registering as a new user on a add on blog it redirect you to the aMain blog and offers a site

When Registering as a new user on a add on blog it redirect you to the Main blog and offers a site of their own and shows the TOS of the main blog. I checked with all the browsers chrome, IE, Firefox, Safari, Oprea and same results. blog site in question http://bloginsphere.com and add on http://phpldtemplates.bloginsphere.com/