Lance,
I assume this is the page you are talking about? https://centerforworldmusic.org/events/
That alteration of the featured images is not something we are intentionally doing. I suspect that your theme or a plugin is cropping these images. It’s not as simple as a CSS change, because the images themselves are being cropped to these shorter dimensions. You can confirm this is true because some of the images are taller than others.
I went ahead and tried the latest version of Enfold myself and did not immediately see the same problem, although you likely have a lot of customized settings.
Is it possible for you to go through our conflicting testing guide on a test site? Keep in mind that to test this, you will have to upload a new image and see the effect, since whatever is causing the shortened images is cropping them and this is most likely occurring during upload.