My own icon site origin features

Hello. I have SiteOrigin feature icons in my page. I import my own icons but they appear cut off or kind of tiled. What is the correct size of icons and format so that this does not happen? Thank you. if you go to the page you will notice that the dove is cut off and the crown at the end seems tiled. Please help. Thank you

URL: http://distritohispano.foursquare.org