Checkout page broken

Hello there,
In the checkout page, when I select Amazon Pay and once I click on the button, I redirect to the Amazon Pay platform and once I pay and redirected back to the checkout page, my checkout page is broken. Attached the screenshot.

This happens only with the Amazon Pay (no with other payment gateways). You can test our site too.

Screenshot: https://drive.google.com/file/d/1FbIDf3WP_vulWrVEhCGvDDNU1oFaZPGP/view?usp=sharing

Link: https://nivolox.de/

Waiting for your response,
Thanks