Help Needed: Checkbox Issue on Webflow Checkout Page

Hey all. Hoping someone smarter than myself can help with a minor issue but causing a major headache in webflow. On the checkout page of a site I'm building there is a checkbox for 'billing address same as shipping' I can see it in the designer but, firstly I can't see the 'checked' state option to style it and Secondly, I can't get it to show on the live site - nothing happens when it's clicked. I've spent an ungodly amount of time trying to fix it and thought it time to ask for help Appreciate any assistance. Greg Read Only Link https://preview.webflow.com/preview/nad-plus-online-6391706fdd5fc7c1ecf8e10?utm_medium=preview_link&utm_source=designer&utm_content=nad-plus-online-6391706fdd5fc7c1ecf8e10&preview=c5ceaf63dde32f01b5cdc276d0ea3e2c&pageId=67d2ee41e1740f0d5d49fc36&locale=en&workflow=preview