Selecting the checked radio input using jQuery on an Ajax, paged Gravity form

Hi guys

Sorry for the long title! I've got a form on this url:
https://germaine-de-capuccini.co.uk/v2/skincare-expert/

You need this password to access the page:
totally-NEW-GdC

You then need to create an account but just use any bogus email/password to get access to the form in question (sorry, I know)...

OK.. So on page 1 of this ajax form, I have a radio field with two options (male/female).
Using jQuery, I am targeting the 'checked' input - you can see this working with an alert that pops up (for testing purposes)..

jQuery( document ).ready( function ( $ ) {
	$('input').on('change', function() {
	   alert($('input[type=radio]:checked', '').val());
	});
});

If you now proceed to page 2 of the form and then come back to page 1 again, this no longer works. Any idea why not and how I can get around it?! It's been driving me crazy for hours :slight_frown:

Hope you can help, and sorry for the hassle getting access - I had to do this as I have a multitude of people working on the content of this site before it can go live and we can't have the general public seeing it as it is.

Thanks in advance!
Martin