Nevermind me... I was browsing the gallery and I noticed a really really tall thumbnail, so tall it wouldn't fit on one page, I had to scroll down to see the title. The thumbnail must've been 300 x 1000 and that's because the artwork had that aspect. So when the thumbnail is generated automatically, there's no height limit, which is a bit distractive and ruins the browsing experience. Just saying...
some cropping to 500 pixels tall, would be nice. Thanks!