Add to Cart in wooCommerce just relode page and the cart is still empty

When I click on “add to cart” in the product page nothing happens. It just reloads the page but no item is added to the cart.

When I´m logged in as administrator it works fine.
The cart also works if I click on “Add to cart” in the product listing overview.
if i do the paypal-checkout it also works.

I installed some plugins
– avada theme
– german market plugin
– facebook for woocommerce
– paypal checkout
– stripe gateway

I tried to
– disabled all plugins
– tried another theme
– disabled nginx-cache
– cleard / deactivated cache
– tried different browsers
– tried on mobile devices
– deactivated Ajax in woocommerce product settings

The page I need help with: [log in to see the link]

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