I guess there could be cases where a product is plant based, but still contains some animal products. But I'll double check the matching to see if anything looks weird. Also, feel free to provide an example here or to elina@nutritionprices.com of a badly categorised product and I'll investigate
That's probably why. I like plant-based proteins because whey makes me feel gross, but the ones that aren't explicitly vegan might still have trace amounts of casein or gelatin or whatnot.