Membership 2 nickname

I've installed the add-on to control the fields displayed. I've added Nickname to the registration form and it shows up and I can add a name into the field ok. It is shown in the WP user screen ok.

The problem I have is that when I go to the MP2 account page, the nickname field is showing the same value as the Username and not the data entered in to the Nickname filed at sign up. PHP must be pulling the wrong column from the Db