I agree that all this sounds a bit strange... Your experience is certainly not representative of what we see on this board.
Never heard of grip screws being too short. Some ammo related malfunctions can occur depending upon a lot of factors -- the ammo used, how many rounds were fired on the springs in the gun, the grip technique used, etc.
You haven't really provided enough information for us to help you. If you bought the gun new, and your dealer can't help you, call the factory. If you bought it used, you need to deal with the dealer you got it from.
For now I will assume that you are a legit new member and not a troll. When someone shows up with a first post bashing the gun with incomplete and somewhat non-sensical information, I start to wonder... I'll keep watching.
Thanks.