Need help with alignment (I think)

LOVE LOVE LOVE this plugin! It worked with my client's theme where others would not (it's an Elegant Themes theme). Anyway, it looks & works beautifully, except in Internet Explorer.

Here's the page: http://discoverthemix.com/store/products/category/for-her/

What element should I tweak to get the alignment right? The buttons or the content wrapper??