I’m not seeing anything obviously bad about the images, but they do get processed (resized and cropped) by WordPress according to the dimensions set/obtained in the theme configuration.
If you don’t want this to happen and would rather use the full sized images (at the expense of bandwidth/load speed/score in crawlers/seo) you can disable cropping in the theme’s options.
Note that you will need to regenerate the thumbnails/featured images to reflect this change.