CCS/MSP430FR5994: Button Press Interrupt Triggered before Button is Pressed

Part Number: MSP430FR5994

Tool/software: Code Composer Studio

Hi,

I currently have a program that uses the onboard buttons as interrupts to toggle the LEDs, but for some reason, the interrupt function is called before the buttons are ever pressed. 

I used the command P5IFG &= ~(BIT5 + BIT6); to clear the interrupt flags before the IO pins were unlocked, so I am unsure of why this is happening. Can someone please explain why this is happening?

My program is shown here:

#include <msp430.h> 

volatile int flag1 = 0;
volatile int flag2 = 0;

/**
 * main.c
 */
int main(void)
{
	WDTCTL = WDTPW | WDTHOLD;	// stop watchdog timer

    //Configure Unused Pins to the lowest power State (Output direction, tied low)
    P1OUT = 0;
    P1DIR = 0xFF;
    P2OUT = 0;
    P2DIR = 0xFF;
    P3OUT = 0;
    P3DIR = 0xFF;
    P4OUT = 0;
    P4DIR = 0xFF;
    P5OUT = 0;
    P5DIR = 0xFF;
    P6OUT = 0;
    P6DIR = 0xFF;
    P7OUT = 0;
    P7DIR = 0xFF;
    P8OUT = 0;
    P8DIR = 0xFF;
    PJOUT = 0;
    PJDIR = 0xFF;

    //Enable internal pull-up/down resistors
    P5REN |= BIT5 + BIT6;
    //Required to set pull-up high resistor
    P5OUT |= BIT5 + BIT6;

    //Set P5.5 and P5.6 as input pins
    P5DIR &= (~BIT5);
    P5DIR &= (~BIT6);
    //Falling Edge
    P5IES = BIT5 + BIT6;
    //Clear interrupt flags
    P5IFG &= ~(BIT5 + BIT6);
    //Enable interrupts
    P5IE = BIT5 + BIT6;

    PM5CTL0 &= ~LOCKLPM5;       // Disable the GPIO power-on default high-impedance mode
                                // to activate previously configured port settings

    __enable_interrupt();

    while(1){
        if (flag1 == 1){
            P1OUT ^= BIT0;
            flag1 = 0;
        }
        if (flag2 == 1){
            P1OUT ^= BIT1;
            flag2 = 0;
        }
    }
}

//Port 5 interrupt service routine
#pragma vector=PORT5_VECTOR
__interrupt void Port_1(void){

    flag1 = 1;
    flag2 = 1;

    P5IFG &= ~(BIT5 + BIT6);
}

Thanks,
John