The magnifying glass effect does not work only with the first image (the main one) but with the rest of the colors (brown, black, gray shoes …) and all the images are the same size (600X600px)
Woocommerce is creating a 600px image for the single product image.
On Hover it shows the original Full Size image ie. the one you uploaded to the Media Library. Make sure all your original images are larger then 600px. In the case of your other colors they have an original image size of 1500px. Make sure your first image is also that size.
Hi, I would like to add information or report a bug (or both)
When there is only the featured image in a product, if you make hover it is growing out of its container, and when you stop hover it is stuck there on the full size.
I solved this repeating the same picture as the first gallery picture.