Hello,

In order to settle the issue, navigate to Appearance – > Customize -> WooCommerce -> Product Image and find the size option for product page image as well as images in a grid:

Main image width – Image size used for the main image on single product pages. These images will remain uncropped. Image width used in demo sites are: 600px;
Thumbnail width – Image width used for products in the catalog, Image width for the catalog is 350px;
Thumbnail cropping checkboxes:
Uncropped – Images will display using the aspect ratio in which they were uploaded

Best Regards