Just noticed this after the most recent update. The field 'lastname' gets populated by 'username' and 'email' by the 'password' (on quick registration form). and also see attached images.
Hm, there is no way for the scripts to auto populate these fields. I can only believe that you have a "password" plugin installed on your browser which populates these fields.
Yep, I understand that... Question is more why the fields are not matched correctly? e.g. 'username' is populated in 'lastname' field and 'password' is populated in 'email field', etc...