Some of the click sites seem to have switched to using HTTP instead of HTTPS and the pages won't load from the current links listed. Allure of Neglected Dragons, Silvi's Lair, Valley Sherwood all seem to have this issue.
Unfortunately, Fandom Wikis default to https protocol for security. If you view the source code of the Click Sites page, you'll see that the links are coded with http, but Fandom is translating them to https when the page is rendered.
I'll keep looking to see if there's a way to override this, but since it is a security issue I'm not sure there will be. :(