Ateeq Rafeeq

Hi Please check this image https://bit.ly/2QeKEtO you can see the white borders around your image, And when theme display your image in circle these borders display on all sides, i recommend you to remove these borders and the problem will be solved. You would need to re upload images after removing these white borders. Thanks.
If that seems difficult you can try a different way by displaying your teacher's images in square view instead of circle view for that please add following CSS into wp-admin >> appearance >> customize >> additional CSS. This will remove border, and display images in square view.
.teacher .teacher-thumb img {
border-radius:0px;
}
.teacher .teacher-thumb {
background-color:transparent;
border:0px;
border-radius:0px;
}
I have added this CSS for you as you provided logins, but if you want to keep using the Circle view then remove it by going wp-admin >> appearance >> customize >> additional CSS and then you would need to re upload images without white border. Thanks