User locked out from signing in

Hi
I have started to constantly receiving mails from WordFence (like 10 a day) saying that a user has been locked out from singing in at https://mysite.dk/wp-admin because of a wrong user name.
What I don’t get is that I am using the plugin WPS Hide Login which means that I have changed the login-address from the original URL to something I came up with myself. So.. how in the world can someone or some bot constantly be trying to login?

Hope you can help
Thanks