If the surface tool is not moving properly, it means the track is off. You may want to check out our getting started videos to find out a bit more on what to look for when tracking and how to track optimally: http://www.imagineersystems.com/mocha_Fundamentals
Try adjusting the areas you are tracking. Make sure you are avoiding reflection in the screen, those will throw your track off.
I can't see your screenshot, the link is broken.
Let me know if you have any questions.