My Body Gallery?

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I found a website a while ago called mybodygallery.com and I've been looking at it recently just to see where I stand in comparison to other women. I noticed something funny when entering my sizes and height. I'm 5' 4" and at 202 lbs I wear size 12/14 and L/XL shirts so I use those interchangeably on the site. Without entering a weight, I find a large amount weigh 170-180 lbs, and only a few weigh 200 lbs. I understand we all carry our weight differently, but I just think it's odd that I wear small sizes for my weight. Has anyone else used this site? Have you found the same thing? Why do you think that happens?