Hello There,
Thanks for writing in! The One Page Navigation functionality is not completely available in Pro yet. It was not available at all in the previous version, but in the new version which you installed already the smooth scrolling functionality is working, but the code does not calculate the sticky header height at the moment. There are many factors involving the height of the sticky header due to the complex nature of the Header Builder.
Meanwhile, to be able to resolve the issue in the page in question, please edit the page back in Cornerstone and in Cornerstone custom js section, Custom JS, insert the following custom js code
jQuery( function($){
$(document).on('click', '.x-btn[href^="#"]', function( e ) {
var ID = $(this).attr('href');
e.stopPropagation();
$('html, body').stop().animate( { scrollTop : $(ID).offset().top - 132 }, 'linear' );
});
});
Hope this helps.