Yep, the box on the right of the banner is a smaller glitch on the site. And as mentioned, it doesn't lead to anything special.
What you can login on here is the actual forum and the only thing you really need.
You can always try to sign out from the forum, delete all the cookies saved from Feral-heart.com.
Restart the webbrowser, and see what happens then. Sometimes that helps, sometimes it doesn't.