Looks like there maybe a problem with your plugins.js
on line 35 according to my console. I'm getting the error TypeError: portfolioContainer.imagesLoaded is not a function.
The code in question is:
if (jQuery().isotope){
var portfolioContainer = jQuery('.w-portfolio.type_sortable .w-portfolio-list-h');
if (portfolioContainer) {
portfolioContainer.imagesLoaded(function(){
portfolioContainer.isotope({
itemSelector : '.w-portfolio-item',
layoutMode : 'fitRows'
});
});
jQuery('.w-filters-item').each(function() {
var item = jQuery(this),
link = item.find('.w-filters-item-link');
link.click(function(){
if ( ! item.hasClass('active')) {
jQuery('.w-filters-item').removeClass('active');
item.addClass('active');
var selector = jQuery(this).attr('data-filter');
portfolioContainer.isotope({ filter: selector });
return false;
}
});
});
jQuery('.w-portfolio-item-meta-tags a').each(function() {
jQuery(this).click(function(){
var selector = jQuery(this).attr('data-filter'),
topFilterLink = jQuery('a[class="w-filters-item-link"][data-filter="'+selector+'"]'),
topFilter = topFilterLink.parent('.w-filters-item');
if ( ! topFilter.hasClass('active')) {
jQuery('.w-filters-item').removeClass('active');
topFilter.addClass('active');
portfolioContainer.isotope({ filter: selector });
return false;
}
});
});
}
So it looks like it's an issue with the Isotope.js library and how your theme is implementing it. I tried to look at the theme itself in a demo but it is apparently no longer available.
Since it is a premium theme, you might want to check with the place you got it from and look into support.