Still looking at the code but for me (1024x76

its only the CV Writing Services page that does the shift, and its a shift to the right (compared to the other pages). I noticed that it was also the only page that wasn't long enough for a scrollbar to appear, so I tested it out with a reduced browser height and there was no 'shift' occuring. I don't know why it stopped doing it once the site was longer then my browser window, but it did stop it from happening.
If your resolution is higher then mine then maybe other pages don't go past the bottom of the window, which would explain why you see more pages shifting. I will continue looking at the code and testing some things out, let you know if I find anything else.