Board Thread:Questions and Answers/@comment-27702351-20160709130124/@comment-25122955-20160709140010

I think the message wall case is an error, but the gallery case is happening when the user tries to edit the gallery by clicking 'Add a photo to this gallery' button on the page that is shown by  tag.

So, when you try to edit the gallery, go to the separated gallery page, then edit the gallery.
 * Hard Level/Gallery/Reality/1 - World 1 to 4
 * Hard Level/Gallery/Reality/2 - World 5 to 8
 * Hard Level/Gallery/Reality/3 - World 9 to 12
 * Hard Level/Gallery/Reality/4 - World 13 to 18
 * Hard Level/Gallery/Reality/5 - World 19 to 22
 * Hard Level/Gallery/Reality/6 - World 23 to 26
 * Hard Level/Gallery/Reality/7 - World 27 to 30
 * Hard Level/Gallery/Reality/8 - World 31 to 34