We have seen something similar to this in the past; it happened when a site user had multiple browser extensions turned on. Unfortunately, we can't control for all the customization end users might make to their browsers. You may want to try turning off any browser extensions to see if that helps.
Article ID: 95, Created: 1/2/2013 at 2:38 AM, Modified: 1/2/2013 at 2:38 AM