User blog comment:JoshuaJSlone/Wiki Policy: Page Titles/@comment-131168-20131130115825

Something else about double-A pages I'd noticed before but the reasoning didn't click until now. If you go to, for example, Atarashii Watashi ni Nare! / Yattaruchan, at the top you'll see a link pointing to just plain Atarashii Watashi ni Nare!. It turns out this is because Wikia considers the / to mean it's a subpage. In this case, that the content is on subpage " Yattaruchan" of main page "Atarashii Watashi ni Nare! ". It doesn't make any serious difference in how anything works other than that link at the top, but I'm trying to search around and see if there's a way to stop it from showing up.