Convoy: not getting the same mission

Hello. i keep getting the random missions, they have to /work then /convoy 0 to join their missions.
here the code, that starts the missions

Code:

---

CMD:convoy(playerid, params[])
{
    new Playermission = PlayerInfo[playerid][StartingPoint];
    if(sscanf(params, "u",playerid)) return SendClientMessage(playerid, -1, "USAGE: /convoy [playerid]");
    if(GetPlayerTeam(playerid) == 1)
    {
        new m = GetVehicleModel(GetPlayerVehicleID(playerid));
        if(m == 514 || m == 515 || m == 403)
        {
            new t = GetVehicleModel(GetVehicleTrailer(GetPlayerVehicleID(playerid)));
            if (t == 435 || t == 450 || t == 584)
            {
                if (GetPlayerVehicleSeat(playerid) == 0)
                {
                    new Text:Work[MAX_PLAYERS];
                    new rand = random(sizeof(trucker));
                    PlayerInfo[Playermission][StartingPoint] = rand;
                    new convoytextdraw[MAX_PLAYERS];
                          format(convoytextdraw,sizeof(convoytextdraw), "~g~go to %s ~w~to load your trailer with ~y~%s", trucker[rand][lpname], trucker[rand][loadname]);
                    TextDrawSetString(Work[playerid], convoytextdraw);
                    truck_PlayerJob[playerid] = 1;
                }
                else
                {
                          new string[240];
                    format(string, 128, "That player isn't at the driver seat of the vehicle.");
                    SendClientMessage(playerid, 0xFFFFFFFF, string);
                }
            }
            else
            {
                      new string[240];
                format(string, 128, "That player doesn't have the correct trailer, tell him to attach one!");
                SendClientMessage(playerid, 0xFFFFFFFF, string);
            }
        }
        else
        {
                        new string[240];
            format(string, 128, "That player isn't on a truck, tell him to get one!");
            SendClientMessage(playerid, 0xFFFFFFFF, string);
        }
    }
    return 1;
}

---

Code:

---

forward Trucker1(playerid);
public Trucker1(playerid)
{
    for(new i = 0; i < MAX_PLAYERS; i++)
        {
                if(IsPlayerConnected(i))
                {
                new rand = random(sizeof(trucker));
                new Text:Work[MAX_PLAYERS];
                new newtext2[MAX_PLAYERS];
                PlayerInfo[playerid][StartingPoint] = rand;
                DisablePlayerCheckpoint(i);
                SetPlayerCheckpoint(i, trucker[rand][lx], trucker[rand][ly], trucker[rand][lz], 10);
            format(newtext2,sizeof(newtext2), "~w~Go to ~r~%s ~w~to load your trailer with ~g~%s", trucker[rand][lpname], trucker[rand][loadname]);
            TextDrawSetString(Work[i],newtext2);
            SetPVarInt(playerid, "PlayerMission", 1); // Set the Player mission.
                }
        }
}

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