This theme has a setting that lets you crop your featured post image so things stay consistent.

- Navigate to the Appearance > Customize > Theme Options > Thumbnail Settings.
- Look for the Crop image for the Front Page Featured Post setting and check the box to crop it before you upload the image.
- Click the
Publish
button.
Normally this should be done if you plan to use the front page featured post. Make sure that this thumbnail crop setting is checked so that when you upload a photo for your blog post, the image will be cropped for you.