GTmetrix and Google PageSpeed still saying to optimize images

I have smushed, then re-smushed all 170 images in my media page; however, the same 10 or 12 images that were listed as needing optimization before I installed your plugins are still showing needing optimization. I have flushed website cache and cleared browser cookies etc. I also re-tested several times to be sure. I did a live chat with support, and they asked that I submit a ticket. I've included 3 screenshots. 2 are google pagespeed (1 desktop, 1 mobile. same images), the other is GTmetrix.

Thanks in advance!

Jon