I was forever finding that, after I have submitted a bunch of AI Generated images, I ended up letting 1 or 2 slip though as photos instead of marking them as illustrations.
To avoid this, what I recommend is clicking through all your images (that are in review) to confirm they are marked as illustrations. It's a pain if you have a lot of images but, that way, you can delete and re-upload there and then. That way you won't rather find out (as I did) weeks later that you haven't catalogued them correctly!