MSP430FR5739: Internal pull up/ pull down not functioning as expected

I wrote a code which lights up leds when two switches connected to pins in port 3 are pressed together. The code is displayed below:

#include <msp430.h>

int main(void)
{

  WDTCTL = WDTPW + WDTHOLD;                 // Stop the watchdog timer

  P3DIR  = 0;                // Set P3as inputs
  P3REN  = (BIT0 + BIT1 + BIT2 + BIT3);    // Pull BIT 0,1 HIGH and Keep them HIGH.
  P3OUT  = (BIT0 | BIT1 | BIT2 | BIT3);   

  PJDIR  = ( BIT0 + BIT1 + BIT2 + BIT3);    // Set outputs in PORT
 
  PJOUT  = 0; //set initial outputs to LOW

  while (1) {

    if ((!(P3IN & 0x04)) && (!(P3IN & 0x08))) {

        PJOUT = ( BIT0 + BIT1 + BIT2 + BIT3);

    }

   
  }
}

The code failed to work as expected and it turned out that adding a external pullup resistor to port 3.2 solved my problem.

Is there any particular reason why the internal pullup configuration of port3.3 works fine but not in port 3.2?

P.S. I am using the FRAM experimeter's board which consists the MSP430FR5739 MCU.

Thanks in advance.