Isotope sorting& filtering enhancements for Unveil Lazy Load: Add this three lines to refresh lazy load items and display them after sorting / filtering.

isotope-lazyload.js

var $iso = $('.container').isotope({
  itemSelector: '.item',
  layoutMode: 'masonry',
});

// Refresh lazy load
$iso.isotope('on', 'layoutComplete', function () {
  $(window).trigger("scroll");
});