Sounds like you've gone from version 2 to version 3 and then back again: there should be a link at the bottom of the page saying "Try the new Chess.com!" that you can click, and it will take you back to V3.
The switching may have something to do with the cookies and cache on your browser, but try that link first.
This site got a sweet makeover a few weeks ago, everything had a new look, was real streamlined, and then everything was put back to how it was before without any notice and without any explanation. What's the deal?