[Shinja]

1. You already set playerid param why would you loop again through all players?
2. You must get the player position for the first time at spawn

PHP код:

public OnPlayerSpawn(playerid)
{
    GetPlayerPos(playerid,Pos[0],Pos[1],Pos[2]); 
    return 1;
}
forward AFKCheck(playerid); 
public AFKCheck(playerid) 
{ 
  new Float:Pos[3];  
     if(IsPlayerInRangeOfPoint(playerid,2,Pos[0],Pos[1],Pos[2]))  
     { 
        AFK[playerid]++;  
     } 
     else GetPlayerPos(playerid,Pos[0],Pos[1],Pos[2]); 
     if(AFK[playerid] == 60) 
     { 
        AFK[playerid] = 0; 
        Lounge[playerid] = true; 
        SetPlayerPos(playerid, -794.806396,497.738037,1376.195312); 
        SetPlayerInterior(playerid, 1); 
        SetPlayerVirtualWorld(playerid,10); 
        IsPlayerInLobby[playerid] = 1; 
        SetPlayerHealth(playerid, 99999); 
        ResetPlayerWeapons(playerid); 
        new string[250]; 
        format(string, sizeof(string), "_AFK_%s", PlayerName[playerid]); 
        SetPlayerName(playerid, string); 
        SetPlayerColor(playerid, COLOR_GREY); 
      }  
  return 1; 
}