The thumbnails displayed by the plugin for the next and previous products do not match the actual featured images of the product names that are listed with them.
http://calyxwellnesscentre.com/shop/bubba-kush-gram-cannabis/
Plugin, Storefront Theme, WordPress, etc. all up-to-date.
Not sure if the issue is new as we just added all of the images yesterday - prior to that we had a custom default image in place.
https://wordpress.org/plugins/storefront-product-pagination/