No offence but most of your comment didn't make sense.
I think (I could be wrong though) that what you're describing is a mistake on your part and not a bug.
It doesn't matter what any of your images are named. All you have to do is create a folder and put all your custom images in there. Open Launchbox and go to the game you want to edit. click and hold (or press and hold) on the game/platform to open the options popup, select change media, then choose which image you want to change and use the browser to find the image you want to use. Once you select any image and then go back it should show.