User signup is not redirecting to welcome page

Firstly I am using the latest version of Membership and the Latest version of WordPress.

When a user follows this link

http://anappleaday.net.au/staging/register/?action=registeruser&subscription=3

They get to the correct signup form for that level. However when they enter their details into the form they are directed to a page that states

“You currently have a subscription for the Organic Food Directory Member subscription. If you wish to sign up a different subscription then you can do below.” See screenshot a

There is a link to “continue” that takes the user back to the signup page with a subscription level available that they are already assigned. See screenshot b

Can someone help with this?

Thanks

Toby