The images you are using for the featured services are not equal width/height. The first image is 5184 x 3456 pixels!
To fill the circular area, each image’s height and width should be the same. e.g. 160 x 160 pixels.
Alternatively, you could add a line of CSS code to force the images to fill the height of the circle – height: 100% – but they would be stretched vertically and may not look right.
In ‘Additional CSS’: