why do I have to enter the same email and pass word twice?

I do my log on with my email address and also the password.  I hit enter.  The message from Comcast says its not recognized. So I enter the same email address and password and hit enter and it goes to my emails?  Why do I have to enter it twice. Then  you get this  message and the pop up says you must now enter another email address other than  the one used by Xfinity. I  live alone. I do not know anyone elses email address that I wish to put in that space.  Its say if you ever get locked out. Well I am getting locked out of my emails because of some rules that Comcast has made.  Sorry but its become totally ridiculous for this to happen on a consistant basis and if you click on the  chat things it tells you that you must now change your password and your email address. I am not going to do that. So either Comcast/Xfinity gets its act together or I am going to go to sign on with AOL. This never happens to them.