Checkout page not working

Hello,

After the woocommerce update my checkout page crashed and i have no idea how to restore it:
https://walldecor3d.co.uk/checkout/
It should be look like this as it was before: https://walldecor3d.co.uk/en/checkout/
– The Customer details ( személyes adatok ) should be the first which is opened if a visitor arrives to the checkout page
– There should be a checkout box at the billing details if customer want to write them or not.

Please help me….

Thanks,

Sincerely,
Laszlo