I have installed this plugin and I am trying to test the form and user notification emails. I have created a basic form with username, password, and email address. I have been able to complete the form once then delete the user from the users list in WordPress but when I go back into the form on the front-end to re-test I get the message saying the username has been taken and/or email address is registered but I have definately deleted the user from the WordPress users list. Can you tell me is there some other location storing user data? Thanks.