The images for my product categories are shown twice on the Woocommerce 'Shop' page. I am using WordPress, latest version. At the top of the page, they are shown in a 6 x 5 array of small buttons that will take the visiting customer to the appropriate shopping page, which is just what I want; however, below that array, there is another display of the same product categories. This second one is shown in much larger images.

I obviously don't want the second display of images to show up on the 'Shop' page at all. There must be some setting that I have inadvertently set, but I just can't see it anywhere.

Any help would be much appreciated.