[Undef1ned]

Your code is wrong. You must have a variable to verify in which game the player is.

Example:

PHP код:

enum
{
    Game_None,
    Game_LV,
    Game_BS
};
new 
    PlayerCount[2],
    InDM[MAX_PLAYERS];  
CMD:lobby(playerid, params[])
{
    if(InDM[playerid] == Game_None) return  SendClientMessage(playerid, COLOR_LIGHTBLUE, "You are not inside any DM area.");
    
    switch(InDM[playerid])
    {
        case Game_LV: CountInDM[0] -= 1;
        case Game_BS: CountInDM[1] -= 1;
    }
    
    SpawnUser(playerid);
    InDM[playerid] = Game_None;
    SendClientMessage(playerid, COLOR_LIGHTBLUE, "You have returned to the lobby.");
    return 1;
} 


And when you enter a game it would be something like this:

PHP код:

public OnDialogResponse(playerid, dialogid, response, listitem, inputtext[])
{
    switch(dialogid)
    {
        case DIALOG_DM:
        {
            if(response)
            {
                switch(listitem)
                {
                    case 0:
                    {
                        CountInDM[0] += 1;
                        //code
                    }
                    case 1:
                    {
                        CountInDM[1] += 1;
                        //code
                    }
                }
            }
            return 1;
        }
    }
    return 1;
}