Just finished smushing 1.5 Gigs & 3hrs later, nothing is showing

I started optimizing all my images using Smush Pro last night. It took hours to do, shut my site down because of server requests (so I paid more to my hosting company so I could finish the optimization batch) and now I came back in to finish up the last 100 of 1553 images WP Smush Pro had supposedly optimized to find that it is now saying that ALL of the images need to be optimized as if I hadn't done anything at all!

It took nearly 24 hours to do this. Over 1.5 Gigs were optimized in images on our site. What happened? Why do I have to do it all over again?