Hello,
First of all, you should choose sizes for the product grid via Appearance -> Customize -> WooCommerce -> Product Images.
https://gyazo.com/947c7e7c6602b647ab1ad3ff6201f575
Then regenerate your images through the “Regenerate Thumbnails” plugin.
https://wordpress.org/plugins/regenerate-thumbnails/
Also, make sure that your images have a normal size by default.
As a reminder, here’s a link to our Knowledge Base where you can find up-to-date information about Image size and content alignment in a Product Grid.
https://xtemos.com/docs-topic/image-size-and-content-alignment-in-a-product-grid/
If you ever need to reach out to me, please do not hesitate to do so.
Kind Regards