WebDynpro application logoff problem

We have created a WebDynpro iView within the SAP Enterprise Portal 6.20 pointing to the WebDynpro application. We are facing a logoff problem. When the logoff link is clicked, we are directed to the logoff page which its content is “<b>You have been successfully logged off. To Login again click here</b>”. When the <b>click here</b> hyper link is clicked, we should be directed to the login page again but in our case it directs us to the user profile who has logged off.