When you created the page for Project: After Party, the wiki intercepted the "Project:" part and displayed it as "Simpsons Wiki:After Party". It happens to be a reserved namespace, so to get around that, I've named the page Project After Party.
In that page, you had put that the preview was rated 21+. When I watched the episode, the warning on the preview was an R rating, which is consistent for the United States. Did you actually see it say "21+", and if so, are you in a different country? It would be interesting to see that an episode was customized for the country it was broadcast in.