Leads not coming through via Apple/iOS Devices

Hey Adam, how are you syncing data to both Marketo and your product trial manager through this form?

It is unusual that a Marketo form would submit successfully but not have data end up in Marketo. I would probably escalate this to support but am just curious what non-standard things may be happening on the back-end of the form as that is something support will ask you too.

Your code has a glaring race condition.

     form.submit();
     window.location.replace(result['location']);

Form submission is asynchronous.  Location manipulation is synchronous (it will change immediately after the code block exits).  There is no reason to expect form submission to complete before the browser navigates away from the page.  It's a total crapshoot, if everything else is the same, the fact that you're seeing this on mobile devices is merely a matter of comparative local/network performance.

You want the window.location.replace() to happen in the form's onSuccess listener, which is guaranteed to fire after a successful asynchronous form submit.

The Facebook tag is also async and suffers from the same problem.  This is basic async programming: you need to chain your functions together using event listeners.