return page after successful membership purchase is incorrect

When I am testing the membership plugin and successfully complete a membership purchase transaction via paypal – I click the “Return to Stone Ring Books” button on the paypal site and am redirected to the “Protected Content” page instead of the “Registration Completed” page. For now I have just told the system that the protected content page should point to the content I wish to use for the successful registration but this is only a bandaid.

any help would be greatly appreciated!