What's with the Login?

[ctcz28]

For the past several years I've only needed to enter my user name and password at the top of the home page to login. Now I do that and get a popup stating I've entered invalid information and must register to post. Below that are two more fields to reenter my user name and password. When I do this the site admits me. What's with this? Having to enter my login information twice is really irritating.