It works okay without any problems when I view your website and also our demo is okay too.
We need to find out if this is an issue with WooCommerce or with our theme, so this is why I asked if you could look at our other theme demos to see if you see the same problem.
Could you also please look at the demo for the WooCommerce Storefront theme, to see if you have the same issue? Link here: https://themes.woocommerce.com/storefront/product/lowepro-slingshot-edge-250-aw/