Last modified: 2011-03-13 18:06:18 UTC
The above url is just an example. All dated categories have had their content moved to the latest category, the same happened in January. This is an annoyance since at least Swedish Wikipedia uses this to keep track of images with bad licence info. I don't know what's causing this and I guess it can't be reverted, but at least the bug can be fixed so it won't happen again?
The template uses [[Kategori:Bilder som saknar upphovsrättslig information {{CURRENTYEAR}}-{{CURRENTMONTH}}]] to put the images into categories. This is evaluated when viewing a page, not when saving is. So when someone looks at the image, it moves itself to the new category. Works as designed. Use subst: to evaluate the date on save.
OK, but it's weird that all images were moved at the same time... Thanks for the answer anyway, I'll inform the svwiki community.