MSP430FR2633: General purpose input strange behavior

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//*****************************************************************************
// Development main.c for MSP430FR26xx_25xx
//
// This starter application initializes the CapTIvate touch library
// for the touch panel specified by CAPT_UserConfig.c/.h via a call to
// CAPT_appStart(), which initializes and calibrates all sensors in the
// application, and starts the CapTIvate interval timer.
//
// Then, the capacitive touch interface is driven by calling the CapTIvate
// application handler, CAPT_appHandler().  The application handler manages
// whether the user interface (UI) is running in full active scan mode, or
// in a low-power wake-on-proximity mode.
//
// The CapTIvate application handler will return true if proximity was
// detected on any of the sensors in the application, which is used here
// to control the state of LED2. LED1 is set while the background loop enters
// the handler, and is cleared when the background loop leaves the handler.
//
// \version 1.03.02.00
// Released on Wed, Feb 24, 2016  2:01:17 PM
//
//*****************************************************************************

#include <msp430.h>                      // Generic MSP430 Device Include
#include "driverlib.h"                   // MSPWare Driver Library
#include "captivate.h"                   // CapTIvate Touch Software Library
#include "CAPT_App.h"                    // CapTIvate Application Code
#include "CAPT_BSP.h"                    // CapTIvate EVM Board Support Package



unsigned char ucButtonPressStatus = 0;

void main(void)
{
	//
	// Initialize the MCU
	// BSP_configureMCU() sets up the device IO and clocking
	// The global interrupt enable is set to allow peripherals
	// to wake the MCU.
	//
   	WDT_A_hold(WDT_A_BASE);
	BSP_configureMCU();
	__bis_SR_register(GIE);

	//
	// Start the CapTIvate application
	//
	CAPT_appStart();

	// Enable interrupts on ROW1-ROW3 ports
	// Falling edge
	P1IES |= (BIT4 | BIT6 | BIT7);
	// Clear interrupts
	P1IFG &= ~(BIT4 | BIT6 | BIT7);
	// Enable interrupts
	P1IE |= (BIT4 | BIT6 | BIT7);

	// Set columns
	COL1_HIGH;

	LED_OFF;

	__enable_interrupt();

	//
	// Background Loop
	//
	while(1)
	{
		//
		// Run the captivate application handler.
		// Update buttons state if proximity detected.
		//
		if(CAPT_appHandler()==true)
		{
			if(g_uiApp.pSensorList[0]->pCycle[0]->pElements[0]->bTouch)
			{
				ucButtonPressStatus |= BIT1;
			}
			else
			{
				ucButtonPressStatus &= ~BIT1;
			}

			if(g_uiApp.pSensorList[0]->pCycle[0]->pElements[1]->bTouch)
			{
				ucButtonPressStatus |= BIT2;
			}
			else
			{
				ucButtonPressStatus &= ~BIT2;
			}

			if(g_uiApp.pSensorList[0]->pCycle[0]->pElements[2]->bTouch)
			{
				LED_ON;

				ucButtonPressStatus |= BIT3;
			}
			else
			{
				ucButtonPressStatus &= ~BIT3;
				LED_OFF;
			}
		}
		else
		{
			// no proximity - no press
			ucButtonPressStatus = 0;

		}

		__no_operation();

		//
		// End of background loop iteration
		// Go to sleep if there is nothing left to do
		//

		CAPT_appSleep();
	} // End background loop
} // End main()

//
//		Handle GPIO ports according keyboard scan algorithm to emulate 2x3 keypad by 5 GPIO
//
#pragma vector=PORT1_VECTOR
__interrupt void Port_1(void)
{
	// ROW_1
	if(P1IFG & BIT4) {
		// Rising or falling edge?
		if(P1IES & BIT4)
		{
			// Falling edge

			// If button 1 pressed set COL_1 to low
			if(ucButtonPressStatus & BIT1)
			{
				COL1_LOW;
			}

			// set rising edge interrupt
			P1IES &= ~(BIT4);
		}
		else
		{
			// Rising edge
			COL1_HIGH;

			// set falling edge interrupt
			P1IES |= (BIT4);
		}

		P1IFG &= ~(BIT4);
	}

	// ROW_2
	if(P1IFG & BIT6) {
		// Rising or falling edge?
		if(P1IES & BIT6)
		{
			// Falling edge

			// If button 2 pressed set COL_1 to low
			if(ucButtonPressStatus & BIT2)
			{
				COL1_LOW;
			}

			// set rising edge interrupt
			P1IES &= ~(BIT6);
		}
		else
		{
			// Rising edge
			COL1_HIGH;

			// set falling edge interrupt
			P1IES |= (BIT6);
		}

		P1IFG &= ~(BIT6);
	}

	// ROW_3
	if(P1IFG & BIT7) {
		// Rising or falling edge?
		if(P1IES & BIT7)
		{
			// Falling edge

			// If button 3 pressed set COL_1 to low
			if(ucButtonPressStatus & BIT3)
			{
				COL1_LOW;
			}

			// set rising edge interrupt
			P1IES &= ~(BIT7);
		}
		else
		{
			// Rising edge
			COL1_HIGH;

			// set falling edge interrupt
			P1IES |= (BIT7);
		}

		P1IFG &= ~(BIT7);
	}
}