@Boylag,
After you determine which images to keep, instead of deleting the extra images this bug causes - you can go to: "Tools => Cleanup Media", This has been a life saver once I figured it out so I don't have to manually removed hundreds of extra images. Hope this bug gets resolved soon, it is annoying.
*Edited to add - Be careful using the "Cleanup Media" tool as it is incorrectly tagging images as not in use, when they are - and I want to keep them, and when deleted it deletes the image completely when it was in use and I wanted to use it.