I have actually seen this problem as well, and what I have been posting about with distances being inconsistant and shot variancies being wild. You hit a chip, for example, and you have a very low lie <25% and the shot goes only a few yards as opposed to what you used club and shot wise. At times I have seen where you can use a short club, with wind in your face, and go much, much farther than what that club ever should.