I got an email today thanking me for participating in the ongoing beta for Arqade Meta, and congratulating me for making the leaderboard which is a nonexistant page. Does this have something to do with the responsive design updates, or was it just a bug that the email was sent? As far as I know, meta sites aren't supposed to send these emails, and Arqade isn't in beta.
Thanks for reporting this!
We had a hiccup where the chunk of code that excludes meta sites from these emails got removed accidentally - oops! A few different sites had these emails go out, including Arqade, Information Security, and Software Engineering. That's been fixed now, so it shouldn't be a problem moving forward.
Apologies for any inconvenience!