Team Social Media icons not working in Safari Mac/iPhone/iPad

Hello,

When viewing this page:
http://www.performanceindustrial.com/about/our-team/

In Mac Safari, or on the iPhone/iPad Safari, the social media links that appear on rollover aren’t displaying correctly. Rather than just displaying the icon in a circle, the entire url for the link is appearing in an offset icon disc.

You can see an example of it here:
http://www.performanceindustrial.com/wp-content/uploads/2014/03/image.png

All of the team members with LinkedIn Profiles have this issue.

Any ideas what is causing it, and how to fix it?

Thank you for any help you can provide.

-=Mark