Featured image not related to product in SHAREs


I am using the Amazon Affiliates plugin in WooCommerce. When I Share a page the product image that is displaying is not the one that is relevant to the product details I want to Share but something that comes up at random. My site url is www.shop.otasurvivalschool.com. Am I doing something wrong or is there a glitch somewhere?

Btw, I am a complete newbie.