Broken column layout

We lost the 3 column layout after our initial 4 are loaded, and now all of them are showing in a single column.

Here is the shortcode we are currently using:

[ajax_load_more post_type="post" posts_per_page="6" offset="4" button_label="Load More" scroll="false" destroy_after="2" container_type="div"]

The page I need help with: [log in to see the link]