Hi Lifewithatrucker,
the theme you’re using is a magazine theme for professional online magazines and news websites. You can see plenty examples of such sites in our showcase.
With that said, the images you’re uploading are not really suitable as they contain text and mockups. These kind of motives very likely will be cropped as WordPress will generate thumbnails out of the original image.
The first image on your website is actually correct as WordPress generated the necessary thumbnail with size of 326 × 245px. The other thumbnails just have not been regenerated as you probably uploaded them before you were using the theme.
You can regenerate your thumbnails to see how that looks like (you always should do that after a theme change). Ideally you should use regular photos as featured image so that WordPress can generate the necessary thumbnails without cropping or cutting off the text on your images.
The thumbnail sizes and everything else regarding uploading images properly is covered in the theme documentation.
