Ar you sure to be talking about experience points (XPs)? Not coins or something else?
As for XPs, nothing to fix but players' manners.
The game is very consistent in NOT awarding finish-of-game XPs if the game isn't finished.
So you basically get the shot XPs (wonder how they can be 27 on the first hole?) and, if applicable and if player is lucky, the CDP XPs, starting from 47.
My two Pfennig: Play MP games only for fun, not for anything else.
Not average, not XPs, not credits...