Fashe Theme product images blurry on home page

I am using fashe theme on socialclothing.co and on mobile, the product images are all blurry on the home page. I can see when I inspect the page that the intrinsic size of the images is smaller than the container, but the actual image that I uploaded is 2000x2500px so I don’t understand why it is being shrunk to a size smaller than the container for mobile. I understand they need to be reduced in size for mobile, I just don’t want them to be blurry, and I can’t find where in the code this needs to be changed. How/where can I find the code that needs to be altered so that this can be fixed?