Your new page for The Boy Detectives Club (series) was lacking one critical thing because it was created by hand -- the category for the work itself. If you use the boilerplate you get through the ATT Page Creator, oversights like that won't happen.
Also, there's no need for a media type on this page -- and in fact, "(series)" is used to identify live-action TV shows, so it's also the wrong media type. I've renamed/moved the page (and the Trivia subpage) accordingly.
-- Looney Toons