Upgraded WP --Header Image Offset

Y'all:

I just pushed a site I maintain to the new version of Wordpress, and... The header images are now offset to the left of the rest of the page on the main landing page. You can see the effect here:

http://shepherds.edu

I have custom code around the header for the menu, but not for the placement of the header image, or for the placement of the page below the header image... Inspecting the element, it looks like it's <div class="otw-twentyfour otw-columns"> --and I know WordPress just updated their themes in the recent release, so I suspect it's a change in the css ATH is calling to render this bit. But I've no idea where the offending code might be... :-(

Has anyone else seen this?

Russ