Hi,
Thanks for the answers. Turning on and off different payment methods didn’t help. But the thread @rainfallnixfig posted helped. Probably it is the same issue. I cleaned up the form-checkout.php file. For now it solved the problem.
Is the woocommerce storefron theme is a wordpress theme or that is something different? Because if it is a wordpress theme, changing it would mean that I have to change the look of my whole website to have woocommerce look correct?