Post Images Stretching Vertically in IE

Hello!
I’m using the Fresh & Clean Template. When I insert images into a post, they look perfect in firefox, but when in internet explorer they have been stretched vertically just on the post’s page. They show up fine as featured images and when you click on the image from inside the post, it opens in a new window at the correct aspect ratio.
I’ve done a bit of research on google, but had no luck. Anyone know an easy fix for this? I wonder if it’s an issue with the theme itself? Thanks so much!