featured images not responding

Hi my featured images for some of my pages aren’t responding correctly when you actually look at the site on a mobile phone. It cuts off part of the images. The text and content on the pages respond fine, just not the featured image. I’ve got Jetpack’s Mobile Theme plugin and Mobile Smart.
Here’s the link to my site (http://notablyyoursevents.com/) and i’ve attached a screenshot of how it looks on a phone.
Thanks!