A couple of points that I can address off the top of my head...
Additional image thumbnails on top of each other? I found a pair in Blue AB Bells Bracelet and they look normal. What were you wanting?

Image names need to have unique bases. You can't have one product's main image named J3 and another's named J34 - try J03 and J34 (or J003 and J034 - use enough digits that you will never overflow.) The Zen magic of additional images works by identifying all images that start with the name given to the main product image.