I don't think so but possibly... Are all the sort orders set to 0 in the image swapper? I should have mentioned that there is a difference depending on whether or not you have sub directories underneath the images directories. You can read more about it here: https://www.zen-cart.com/tutorials/index.php?article=58 . Specifically, the underscore actually plays a role in the image name if you have sub directories. I don't think it's required if all your images are in the default directory as yours are.
I know what you mean about the randomness of it, I struggled with it all day once, finally I created a subdirectory and it hasn't seemed to be an issue since. (If you do this then underscores are required for proper display order)
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