After lot of troubleshooting i could confirm the bug on your site therefore notified the theme developer about this so that it will be fixed.
The issue will be fixed ASAP.
In the meanwhile i have resolved the issue on your site by editing following line of code.
'lightbox_woocommerce' => ( get_option( 'woocommerce_enable_lightbox' ) != 'yes' ) ? ', .woocommerce-page a[data-rel^="prettyPhoto[product-gallery]"]' : '',