I am getting some wonkiness with JCE editor on the front end of ED, not sure if it is ED side or JCE side.
Hello Kane,
I've checked your issue and found out that the issue is came from the template you are using. I've tried to change the template to Protostar, and the popup is displayed correctly: http://screencast.com/t/rV8vGMavbE . You might want to consult with your template developer about this issue.