Plugin not showing on variable products

Hello,

The extra product option fields are not showing at all on any of my variable products, however they show up when I change the product to single product. Why is this? Can you help me solve it please?

Variable product with activated fields (not showing): https://minibar.fotobaren.no/produkt/fotobar/

Single product with activated fields (showing): https://minibar.fotobaren.no/produkt/fotobaren-lite/

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