Thanks. But as I wrote before, the settings under “Woocommerce > Settings > General” were set correctly. This was the case since the beginning. We build WooCommerce stores for our customers on a weekly basis, until now three of them use Woodmart and two of them had this problem. For one of them, the only thing that helped was to reinstall the entire store. With the current problem, it was fixed after you have logged in there. Now it works, although I don’t know where the problem was.
If we ever use Woodmart again, I will keep an eye out to see if the error reoccurs.