EGBKFLYER,
You say that it mostly happens in R22 and R44 Helis, The later model Robinsons have an option for a Vertical card compass (Looks a bit like a DG), or a standard compass.
The Vertical card has become the popular choice for some reason and could be a bit confusing for the student or low timer to orientate themselves with this type of compass, I have seen some have problems with orientation of the DG when just new to the game!!