Only 4 images in product gallery showing

Hi There,

I have uploaded multiple images to the product gallery on some of my product pages, yet only 4 of the images are displaying under the featured product image.

Can anyone tell me how I get it to display all of the images and not just 4? Do I need to install a plug-in to make this happen?

I am using the Mystile theme.

Here’s an example of the product page: http://elevenzees.com/product/bamboo-rectangle-square-placemat-chilewich/

Thanks for your help,
Lindsay

http://wordpress.org/plugins/woocommerce/