I must apologize, I accidently had broken the test bed while working on something else. When you tested, none of the images were optimized.
I have fixed it now and yes, the blue border are Cloudflare enabled ones.
To get true results, first clear your browser’s cache to delete all six images from your cache. Then use a browser to load the Cloudflare CDN test page. Once you do this, the cloudflare server nearest to you should have got the opportunity to cache the three blue border images. Then open up another browser and load the page again. What you see this time is actually what came from their server.
Sorry for the goof up again ??