Hello,
I checked this page http://www.staging17.muranoglassitaly.com/product-category/murano-glass-chandeliers-lighting/modern-glass-chandeliers/ , enabled default WooCommerce theme Storefront and don’t see the additional variation of the mentioned product https://prnt.sc/22yr4wv
Please, make the plugin work with the default theme first and then reply back and we’ll check how it works with the XStore. Or tell us what filter did you use?
Regards