You've obviously ran afoul of 'the beast'. It is a variable of unknown degrees in any facet of your swing / mechanics / calculations.
Yes, this game is mostly mathmatics and can be tracked as such, but you need to be able to factor in ALL variables.
If you would like to spend your day reading, simpley type in 'Beast" in the forum search box. Believe me when I say that this is a FEATURE that WGT has implemented and not a bug. They are striving for the most realistic golf esperience out there. Noone, not even Eldrick Tont Woods can put the ball exaclty where he wants it everytime.