Adding new user in CWP with the same name but other password and domain

As a mistake I've added one more user with the same name to CWP but with a new domain and new password.
After that in the list of users I can see only the old one but the adding procedure was successful.
Can you explain for me is it still any records about the new user in the system?.. If not that means the successful message in my case is wrong and should be changed to something like "There is an existent user with the same name".