Totally Inaccurate Image Optimization Reporting??

[AndrewNYC]

I have been testing my site with webpagetest.org for some time now, and I also use GTMetrix, pingdom and pagespeed. WBT is reporting an F for image optimization with image weights far larger than they actually are. I confirmed this by checking the images one by one and they are all at the size WBT recommends that they should be optimized at. I use photoshop to optimize every image up front, and then Wordpress resized the images down from 1000px to 500px automatically for this particular image size. None of the other sites are reporting the images as being un-optimized so this is a fairly big error on the part of WBT.org. Other than that this is my favorite testing site. Cheers...