Woocommerce not using thumbnails- just resizing originals with css

Hello! I have an up to date install of wordpress and woocommerce using a pretty simple, customized theme.

I recently noticed that woocommerce is not calling thumbnail images for catalog pages, the cart, anywhere.. i hadn’t noticed earlier because everything looks OK. For example: the cart displays 32x32px thumbnails, but is merely re-sizing the original image (1000x10000px) down to 32×32 instead of calling a smaller file such as the 150x150px thumbnails. it seems to be doing this anywhere a smaller image is used and my main catalog page is almost 40mb which is ridiculous- it should only weigh 1.5 or 2mb…

if you’re feeling frisky, the 40mb catalog page is at superfly5000.com/collections/ (NSFW!!!)

Both woocommerce and wordpress image settings are set to 150×150 and 300×300. WC single product images and WP large size images are set to 0x0 so it will call the original image.

I have regenerated thumbnails and am about to convert all my PNG’s to JPG’s to save some weight but I really don’t want to lose transparencies..

Any ideas??