You can adjust the thumbnail sizes in the woocommerce > catalog tab. The thumbnail resizing options are at the bottom. You will have to play around with the sizes to get what you want. Basically what is taking place out of the box is the thumbnail sizes generated don’t match up well with the css of the theme so images look blurry.
There are likely other measures you could take to remedy the image issue, but this in my opinion is the easiest solution. If you want to fix other thumbnails auto generation sizes you can do that in WP Settings under media just to be sure you don’t have 8 different thumbnail sizes being generated.
Good luck.
