[Mugala]

if u're using random code for 2 times, than u must use it one time and save it anywhere, from example u must this first random generated number in PVar (SetPVarInt(playerid,"RandomMoney"); and than when he reaches the checkpoint, u must give him this RandomMoney (GivePlayerMoney(playerid,GetPVarInt(playerid,"Ran domMoney"));

if u have not this issue, show us more code.