Custom social icons visual error on mobile

I try to upload new custom social icon 68x68 png file on desktop as you can see everythink it's ok and perfect screenshot: https://www.dropbox.com/s/a6vrgwxuwoit9hp/custom1desktop.png?dl=0 on mobile the icon go automatic on the top screenshot: https://www.dropbox.com/s/avmr28xmimogoop/custom%20icon%20mobile.png?dl=0