Price doesn't change in the desgin view, only when I add product to cart

Hello,

i can't find any help for my problem. When I add Images or Text to the product in the designer, the price doesn't change automatically. Only when I put the Product into Cart, the Price in the Cart is changed correctly. I'm using the Divi-Theme with WooCommerce.

Here you can test it by yourself: https://dks-druckservice.de/produkt/herren-t-shirt-work-russell-personalisieren/

Why doesn's the price change and how can I solve this problem?