Hi Karin,
Thanks for taking the time to reach out to us here–so sorry to hear that you’re having trouble with your events! I’ve just had a look at your site linked here, and all of the images appear to be loading properly on my end. Are you still seeing this problem occurring for you? If so, would you mind sharing a link to the single event page for the event that is exhibiting this problem?
Regarding the backend display shown in your screencap, this problem typically occurs on smaller screen resolutions when other plugins are adding additional columns to your event listing. You can hide any unneeded columns by clicking the Screen Options tab at the top of your event listing page and unchecking the boxes for columns you don’t need to display. Click the blue Apply button once you’ve finished making your selections, and you should see your columns expand to fill the newly-opened space.
I hope that helps! Thanks, and let us know if you should have any other questions! 🙂