I am also using debut - checkout leads to "bad request" on mobile, but seems to work fine on desktop. I am not going to switch themes, too much work to redo everything. Has a solution been found to fix the bad request???
Thanks for reaching out. Have you made any changes to the theme's code recently, or added any apps that may effect the cart or checkout?
Victor | Shopify Social Care
Victor | Social Care @ Shopify - Was my reply helpful? Click Like to let me know! - Was your question answered? Mark it as an Accepted Solution - To learn more visit the Shopify Help Center or the Shopify Blog