It would appear as most Share options, email, facebook, linkedin are Font Awesome - however, the Tweet option is not. Therefore when the Tweet Options appears next to the other share options, it is out of line with them. It would be nice to make the Tweet option also Font Awesome to keep them consistent and look nice.
The tweet link is a Font Awesome icon, but there is also some JavaScript which loads Twitter's version of the button in its place. I must have it blocked in my browser because I didn't see it until I switched to another one. The solution is to remove the Twitter-specific JS: Line 1410: [% IF ( SocialNetworks ) %] <script>!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0];if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src="//platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs");</script> [% END %]
This problem is fixed by Bug 26069. Making this resolved *** This bug has been marked as a duplicate of bug 26069 ***