membership redirect is busted, the regexp is probably wrong
After #375 (closed) @lavamind added a redirect from https://www.torproject.org/about/membership/ to https://www.torproject.org/about/supporters/
But instead it redirects to https://www.torproject.org/about/supporters/1 i.e. with a 1 on the end. That sounds like a "typo in htaccess file" situation.