Unfortunately, this is due to a bug that has gone unnoticed for many versions. I mean, a bug within a bug, and I didn't realize it until I went through this whole thing. I have to check if I already fixed it in this new version... If it is not fixed in this new version, it will definitely be fixed in the next one.
Also, to add something related to this... I'm working on some small structural changes in that section of the gallery (among other changes) as you are neither the first nor probably the last person to get confused.