BuddyPress.org

Off the top of my head, it could be that the theme author did not include the proper WP hooks in that particular template (wp_head) so that the stylesheet isn’t loading correctly. Or maybe something in the crop javascript is keeping styles on the rest of the page from being activated. It’s hard to tell without actually seeing the site. Have you tested to see whether the problem persists when using the BuddyPress Default theme?