Product page doesn’t display the checkout button

Hello, since the last update to 3.1.1 (and 3.1.1.1) the product page doesn’t display the Checkout button. When I enable it again in the browser inspector, it works, but only the ‘non-js’ version is shown afterwards.

The setting for requiring users to be logged in is disabled. But even when I am logged in it is not shown.

When I remove the display:none in the inspector, I can checkout and get to the Paypal website fine. Paypal is my only payment method.

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

 

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