It should be fine now.
I've changed your js/gk.scripts.js file (line 151):
jQuery('.gk-horizontal-slide-left-column').each(function (i, element) {
and added this custom css into your override.css file:
.gk-horizontal-slide-left-column img {
display: block;
margin-left: -104%;
max-width: 100%;
-webkit-transition: margin-left .6s ease;
-moz-transition: margin-left .6s ease;
-ms-transition: margin-left .6s ease;
-o-transition: margin-left .6s ease;
transition: margin-left .6s ease;
}
.gk-horizontal-slide-left-column.loaded img {
margin-left: 0;
}
Cheers
Joshua