Something strange is going on. I've reported some wallpapers and those reports were solved wrong. Older(first) wallpapers were deleted as duplicates. Since last update on site I don't know who personally is responsible for dealing with my reports because we only get notification so I'm posting here to highlight the issue.
Here's example form an hour ago: older wallpaper - http://alpha.wallhaven.cc/wallpaper/210180 (deleted) wp that was uploaded month after the one above and was reported by me as duplicate - http://alpha.wallhaven.cc/wallpaper/227577 (still exists)