I don't remember if I've reported here, but I have an idea that happen with more users:

Some several weeks I got some images "stuck" on "review queue". After talk with SS support, the solution was delete them and upload again. Problem solved.

Today, while hanging over my gallery, I find several images duplicated. All images duplicated belong to the same batch that was deleted. I've already report this issue too support, but for those that had same problem with "review queue" would check for duplicated files.