HTML is missing the expected elements at the time that forminatorFront() gets called in index, i.e. a race condition
There is an issue with front.multi.min.js?ver=1.15.0.1
after formatting using chrome dev tools, b.extend on line 5751 runs fine every time followed by handle_submit_custom_form on line 5773, but on mobile devices the handle_submit_custom_form function does not get called.
Please fix this in source code, debugging this in minified js is awful.