Wrong product image on conformation page

During testing of the zip.co Woocommerce plugin i have noticed that the product image displayed on the conformation page is not the product image but the first image from the product gallery, and If the product does not have any additional image then again it will not display the product image but the default graphic that would usually be displayed if no product image is used.
As most of my additional gallery images may be of a chart of it ingredients or the back label it is very confusing when this is used as the product image on the conformation page.
How can I fix this?