I noticed you are using Twenty Eleven theme and tested with this myself. I was able to reproduce this bug, so I have submitted it to our developers. You will be notified here when a solution is available.
Until then, here is a CSS workaround:
Can you add the following code to your child theme, or in Appearance ยป Customize ยป Additional CSS?
.tribe-events-list .tribe-events-loop .tribe-events-event-image {
width: 100%;
}
Our apologies again for this issue. Now that the fix is available via an update, you can ignore the workaround code above. Just run the update and let us know if you are still experiencing issues.