In your style.css file, located here:
https://cuartodata.com/wp-content/themes/hustle/style.css?ver=3.5.1
the following properties are causing the circular crop of the icons:
.widget_woothemes_features .feature img {
border-bottom-left-radius: 100%;
border-bottom-right-radius: 100%;
border-top-left-radius: 100%;
border-top-right-radius: 100%;
}
you can change the values to 0 in the above file, or better yet to use the custom css editor in your theme settings.
in your admin area go to hustle -> General settings -> Display Options -> under Custom CSS add the following code:
.widget_woothemes_features .feature img {
border-bottom-left-radius: 0;
border-bottom-right-radius: 0;
border-top-left-radius: 0;
border-top-right-radius: 0;
}