Thanks for using JoomProfile and sorry for inconvenience.
There is some issue with www and without www. Like when your site is access without www, but still in code Joomla is returning your website url
If your site is access with www, then it is working.
Are you aware of anything which can cause this ?
Note : Please check Config of JoomProfile for registration process. You need to select proper registration fields there, if not done yet.