Classes and setting buttons broken?

When on my profile page, I see three options near the top, just under my picture: Profile, Classes, and Settings.  Below those are what seems to be a feed, perhaps, with only one item that says I joined instructables.  When it first loads, Profile is highlighted.  If I click on Classes or Settings, something seems to load, but I still see the same feed - no classes, no settings. In order to get back to a class I had started previously, I had navigate to it by browsing classes.

This seems like a bug, but if there's something I'm doing wrong please let me know.