New issue today: products will be not added to the shopping cart

Hello everybody.
I have a issue with my woocommerceshop. i have not make any chances but, if i try to put a german or english (wpml-translation) into my basket it will not shown inside the basket or in other words the add to cart button is not working. also the message does not appear that i have added the item into the basket, also when it works sometimes to add a item into the basket. i have tried some stuff. when i change to a basic theme like “storefront” the woocommerceshop works normal.