This is not a real bug but a feedback on the new site: the curriculum used to appear as a side menu you could close/open. It’s kinda annoying that now it takes you to a new page.
In May a brand new version of FCC was released. This included a dramatic expansion of the curriculum, a re-architecture of the application (under the covers) and various changes to the user interface. You can read all about it in the official announcement thread 10 major freecodecamp improvements that are live now.
Good to know, thanks!