Hi Pat,
There is issue with Ajax used in jcal pro extension, we updated this file:
plugins/system/t4/themes/base/js/base.js
added line 89 in this function:
//check anchor link on menu scroll smoothly
$(document).on('click', 'a[href^="#"]', function (event) {
if($(this).hasClass('ajaxlayoutlink')) return;
event.preventDefault();
if($(this).data('slide')) return;
if(['tab'].indexOf($(this).data('toggle')) > -1) return;
if(!$($.attr(this, 'href')).length) return;
$('.js-offcanvas-close').trigger('click');
$('html, body').animate({
scrollTop: $($.attr(this, 'href')).offset().top
}, 500);
});
Pls clear browser's cache and check again.