i guess i am not understanding the issue.. try to be very detailed about what is going.
when youre standing next to the bike, do you have the clutch pulled in when you shift it into gear? are you saying that youre holding the clutch in, shifting it into gear and the bike is rolling forward when you are NOT on it?
then, when you are sitting on the bike, when you pull in the clutch, shift it into gear, the bike does not roll?