Problem using calculator apps for products

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I have a website using calculator apps to calculate the price. I do, however, have the problem that when the prices are calculated and I add the product to cart, it seems like the price can't load in the cart for quite some time just showing a white product picture saying 0 kr (Danish currency) as the price. If I update the cart after quite some time, the problem goes away, and if I add a quantity to the product, the problem also goes away. 

I do not know what is wrong but it feels like the calculators have a very long loading time before they can show the price at the cart page. Does anyone know what to do? Thanks!

An example can be seen here:

Password: kriely