looks like the margin for the large mages is not being set properly.
in the gallery.js file, cind the following code:
fs.setStyles({
marginTop: Math.ceil((this.fullsize.height - fsHeight) / 2),
marginLeft: Math.ceil((this.fullsize.width - fsWidth) / 2)
});
and change it to:
fs.setStyles({
marginTop: Math.ceil((this.fullsize.height - fsHeight) / 2),
marginLeft: Math.ceil(4 / 2)
});