A product attribute displayed in every product when I don’t want to

Hey!

I encounter a problem with our page. Whenever we describe a product in the “Attribute” section and add various variables, in the front-end version there is always displayed one “extra” unwanted attribute (specifically “hmotnost” with always the same value “29-51 g”). This specific attribute with that specific value does not appear, however, anywhere in the products themselves in the WordPress environment.

I tried to search for the source of this strange problem from various perspectives – look into Woocommerce setting, widgets setting,… but I struggle to resolve it. I’d be very grateful for any help on that!

The page I need help with: [log in to see the link]