Why is the 'estimate delivery' section causing checkout errors?

Hi

I just had customer call as the checkout page keeps going around in a loop. It appears that shopify now has an “estimate delivery” section on the checkout which wont allow a person to go further unless its filled out. How do I disable this/ get rid off it as its confusing for customers. I took me a good few minutes to figure out but a customer is not going to take the time.

Niall

I tried turning it off in Theme itself but when I went to try ordering it just keeps going through a checkout loop again. Theme is Warehouse