Bug with image on adminbar and multisite

When you use a custom image on the ultimate branding adminbar on multi site

When you visit a multi site the image lowers itself 2 pixels

Main page http://mufirenet.com/stuff/2013-08-08_16-29-59.png

Multi Site page http://mufirenet.com/stuff/2013-08-08_16-30-42.png