I’ve just noticed that some of my product images are displaying as 300px X 300px when the others are displaying as per their actual size which is 470px X 611px. I’ve checked the media gallery and all images are the same size (470px X 611px) put one category is showing them as 300px. This is causing the shop screen to look really messy with the different image sizes.
Sorry to hear of the problem you are having.
Could you please try regenerating thumbnails on your site using the following plugin?