WX-21 Betrayed Selector

This page is not supposed to exist, but it keeps popping up in the "Pages without categories" section.

What happened is that I accidentally placed this page in the mainspace, then moved it to my userspace where it belonged (without redirect). It kept showing up in the "pages without categories" section, even though the page was deleted. Several attempts to remake and delete the page later, and it's still there.