I think I'm having the same problem as here:
but I wasn't able to find the style sheet to edit. It seems to be my vertical photos that are having the problem, but some are ok. They are only slightly longer than the bar should be. Not sure if I somehow added those photos differently. I can't figure out where to go from here to fix it. Thanks for the help!
http://www.cassidytuttle.com (see the 3rd and last images)