Ran into a weird issue which luckily was a pretty simple fix so I wanted to bring attention to it. Under Woocommerce > Settings > Advanced > Features. There is an option for “Order Attribution” which we have enabled. This adds a “wc-order-attribution-inputs” tag inside the checkout form causing the flexbox to break into 1 column. You can “display:none” the “wc-order-attribution-inputs” tag and it fixes the flexbox. Figured I bring this to your attention so a patch can be applied for it. We’ve had this enabled for awhile and only recently did this cause the styling to break on the checkout page. If it’s not hidden, a customer can not checkout if on a mobile device.