Hello,
Your products images have different original sizes. You should upload them with similar dimensions, then edit Woocommerce settings > Products > Display and add the correct size for Catalog Images. Use hard crop if you want to crop images. Then regenerate thumbnails.
Or you can try to add this code in custom css:
.product-image-wrapper.hover-effect-swap {
height: 375px;
}
.products-grid .product .product-name {
height: 35px;
}
Here is a video tutorial how to create custom.css: https://www.youtube.com/watch?v=Qok2zRedRMY&feature=youtu.be.
Regards,
Rose Tyler.