Problems with UDP communication (between MAX and Arduino)

Hello everybody, I have a problem sending data via MAX/MSP to an Arduino.

This is a prntscreen of the MAX sketch I've made
[img]http://i.imgur.com/keCxR.png[/img]
Pretty simple stuff, it collects 3 bytes generated randomly by 3 different "drunk" functions and send them via UDP to the Arduino.

This is the Arduino code

#include
#include
#include

#define localPort 7400

byte mac[] = {0x90, 0xA2, 0xDA, 0x0D, 0xE5};      
IPAddress ip(192, 168, 1, 177);                

EthernetUDP Udp;                                  

int PACKET_SIZE = 0;

void setup()                                      
{
 Serial.begin(9600);
 Ethernet.begin(mac, ip);
 Udp.begin(localPort);
}

void loop()
{
 PACKET_SIZE = Udp.parsePacket();
 byte packetBuffer[PACKET_SIZE];

 if (PACKET_SIZE > 0)                            
 {
   Udp.read(packetBuffer, PACKET_SIZE);
   for (int i = 0; i
   {
     Serial.print(packetBuffer[i]);
     if (i < (PACKET_SIZE - 1))
       Serial.print(", ");
     else
       Serial.println(".");
   }
 }
}

Easy, it prints into the serial monitor the data recevied via UDP by MAX/MSP. The problem is here...
[img]http://i.imgur.com/KzKfr.png[/img]

I should receive only 3 bytes, I can't understand why I get 28! Also - the correct ones - are the 20th, 24th and 28th. Seems like the others are something that comes from MAX/MSP but I don't know why and I don't know how to avoid this problem. I'm looking for some help, hope you'll enlighten me guys!
Thanks for your tips!

PS: I've just discovered something cool, the first 4 bytes (108, 105, 115, 116) compose the word "list" according the ASCII table, could this help?