@EugeneCXY I’ not sure what that screenshot represents, is that a code to add a script tag to the store? I don’t think that is a problem
Problem is in this URL
https://arcane-spire-11260.herokuapp.com/thanks-script.js?shop=littosnz.myshopify.com
If you open it in an incognito window, sometimes it redirects, and sometimes it renders a JavaScript. Whatever is happening in the GET request of that endpoint is the problem