Please Help with Retina/Regular Logo display!

I'm trying to setup this Wordpress website right now and the theme allows regular and retina image uploads for logos. It displays the logo fine when I choose just the regular image, but when i upload a retina image as well, it breaks the image and won't display. I've tried making sure the the site-header is the right height and everything but it just won't display. It displays correctly for tablets and mobile.

Can someone please take a look at it and the CSS for the page and see what I'm missing? The site is www.wpceleb.com. When I look at the styling code for that area, it appears to be coded correctly but I just can't seem to find why its not displaying on a desktop browser.