Woocommerce product order checkout zero price

im have really strange problem and im truying to find help at google but im cannot find it anywhere :(

When im make order it's showing me price of product at checkout "0 DKK".

Im using woocommerce and gravity forms product and everythinks it's work but it's from once happen this problem, im hole day truying configure what's im do maybe it's my mistake, im truying disable all plugin except woocommerce and gravity form and gravity forms addon, but problem it's still there :(

Please can anyone help me