[CalvinC]

It has nothing to do with the stock name.

pawn Код:

new len = strfind(stats, "PacketLoss: "); // Defined "len"
  new Float:packetloss = 0.0; 
  if(len != -1) 
  { 
      strmid(stringstats, stats, len, strlen(stats)); 
      new len = strfind(stats, "Packetloss: "); // You define it again, confusing the script

You define the same thing twice, remove one of them.