Membership registration not saving WP Nick Name

Completing member registration using the Membership register page is not saving the Full Name as the WP Nick Name

I am running WP 3.61 and BuddyPress 1.81 and the BP XProfile WordPress User Sync plugin

When the Membership registration form is used there is a Full Name field. But the Nickname is not populated with it.

When completing registration using the BuddyPress register page no data is saved to the xProfile fields but the user does have the default subscription.