Unfortunately I can't seem to upload an image... but you should be able to tell what this would look like... Making a castle, the chunk with part of my wall moves to some random location out of sight and switches with another one. As well as a few other chunk movements that didn't really hurt anything luckily.. Anyone know a way to revert the file to a prior save? Or some way to move the chunks back if I can locate them?
I don't think there's a way of reverting back to an old save, but if you're familiar with MCEdit you might be able to swap them back that way. Alternatively, there's a world recovery thread here. Admittedly, it's meant for flat-out corrupted maps, but it's still worth a shot in case you don't know your way around MCEdit.