Ah I get that. I wonder it that ghost imaging is the cause from going from 480p which is the native resolution and upscaling it to 1080p, almost like stretching it too thin. Thats probably why the OPPO is so highly regarded is that its able to do this quite well, but maybe some DVDs just cant handle it. I've also had blurays where the image just wasnt up to snuff, but maybe because of the techniques used to make the image to 1080p, but I really don't know, I just remember going huh, thats not as good as I thought it was going to be.
