1aspirit
I'm guessing this was a copy-and-paste error. The "clouds" link on the Common Knowledge > Overview page goes to Maps (https://www.librarything.com/commonknowledge/map.php) instead of to Clouds (https://www.librarything.com/commonknowledge/clouds.php).
Overview page: https://www.librarything.com/commonknowledge/
Overview page: https://www.librarything.com/commonknowledge/