RFM69 issue- double count

Projects Programming
7

I'm getting kinda confused here - sorry. I only want to see if the character at position[1] is Ascii 80 (P). I'm not bothered about the rest. I modded the code to that shown below; but get this output:
where both "received from node 1" messages (30s=1 and 30s=2) appear at the same time on the serial monitor and my minute counter increments..
if I add a delay (say 400mS), then each message only appears with each send , (whch is every 30sec) . Its as though without the delay the RFM69 doesn't have time to clear it message rec'd status.

received from node 1, message [P] 30s= 1
received from node 1, message [P] 30s= 2
1
received from node 1, message [P] 30s= 1
received from node 1, message [P] 30s= 2
2
received from node 1, message [P] 30s= 1
received from node 1, message [P] 30s= 2
3
received from node 1, message [P] 30s= 1
received from node 1, message [P] 30s= 2
4
received from node 1, message [P] 30s= 1
received from node 1, message [P] 30s= 2
5


void GetClockPulse()
{

  // RECEIVING

  // In this section, we'll check with the RFM69HCW (RFM69)to see
  // if it has received any packets:

  if (radio.receiveDone()) // Got one!
  {

    // Print out the information:

    Serial.print(F("received from node "));
    Serial.print(radio.SENDERID, DEC);
    Serial.print(F(", message ["));

    // The actual message is contained in the DATA array,
    // and is DATALEN bytes in size:

    //for (byte i = 0; i < radio.DATALEN; i++)
   //{
      Serial.print((char)radio.DATA[1]);
   // }
    Serial.print(F("]   30s= "));
    if (radio.DATA[1] == 80) //  Ascii P
    {
      radio.DATA[1] = 0;
      radio.DATA[2] = 0;
      /* display.setCursor(102, 1);
        display.setTextSize(1);
        display.setTextColor(SSD1306_WHITE, BLACK); //clear noise botton of screen
        display.print(ThirtySec);
        display.display();
      */
      //increment time every two pulses
      Serial.println (ThirtySec);

      //NOW=millis();
      // TimeCheck();
      if (ThirtySec >= 2) //second pulse
      {
        ThirtySec = 0;
        MINUTE++; // add one minute
        TimeChangedFlag = 1;
        Serial.println( MINUTE);
      }
      //delay(1000);
      ThirtySec++;
    }