Flag in if statement not getting set despite conditions being met

I am writing firmware for an MSP430 device that uses LEDs and photodiodes to detect specific types on ink. The device scans at about 155us and the samples under the scanner range from velocities of .1m/s to 3.3m/s. The goal of the device is to test for ink and measure the ink (pass) to test (not pass and pass) ratio and turn on a green LED when the ratio is between the corresponding value and turn on a red LED when it is not. I am using static integer arrays to store the values of consecutive passes and test values to the same index number of each array. After the last index of the array, the index is set back to zero and the old values are written over.

GREEN_LED_ON; and similar definitions are port definitions for my MCU and are verified to be correct.

event is the test result. If ink is detected, event=DETECTED and vice versa

test will be the average set by a GUI, but for now it is nothing because I don't have this part of my function working

While troubleshooting, I turned the LEDs on in various parts of the code and I found that if I make the LEDs turn on with the if(flag==0), they turn on but do not turn off in the if(flag==1)statement when the port definitions are set accordingly. For some reason, flag is never set to one and it makes no sense to me why this doesn't happen. What am I doing wrong?

Notes: *LED conditions related to average are commented out when I put them in other sections of the code for testing purposes

void display(char event, char test) {

static int size=6;
static int array[6]={0};  //array with number of passes for each n
static int n=0;
static float sum=0;//total number of passes
static float average=0;//average pass rate over n
static int consecpass=0; //consecutive passes
static int consecfail=0; //consecutive fails
static int totalnumberoftests[6]={0}; //total number of tests conducted.  Counts the number of passing or failing tests for the nth value
static float counter=1; //used to count the total number of tests
static int flag=0;


    if(n>size)
        {
        n=0;

        }

    if (event == DETECTED)
    {
        if (flag==0)
        {
            sum=sum-array[n];
            counter=counter-totalnumberoftests[n];
            array[n]=0;
            totalnumberoftests[n]=consecfail;
            sum=sum+array[n];
            counter=counter+totalnumberoftests[n];
            n++;

        }else{

        consecfail=0;
        consecpass++;

        flag=1;

        }

    } if (event==NOT_DETECTED){

        if(flag==1)
        {
            sum=sum-array[n];
            counter=counter-totalnumberoftests[n];
            array[n]=consecpass;
            totalnumberoftests[n]=consecpass;
            sum=sum+array[n];
            counter=counter+totalnumberoftests[n];
            n++;

        }else{


        consecpass=0;
        consecfail++;
        flag=0;

        }
    }

    if (consecpass>8000)
    {
        sum=sum-array[n];
        counter=counter-totalnumberoftests[n];
        array[n]=consecpass;
        totalnumberoftests[n]=consecpass;
        sum=sum+array[n];
        counter=counter+totalnumberoftests[n];
        n++;
    }

    if(consecfail>30000)
    {
        sum=sum-array[n];
        counter=counter-totalnumberoftests[n];
        array[n]=0;
        totalnumberoftests[n]=consecfail;
        sum=sum+array[n];
        counter=counter+totalnumberoftests[n];
        n++;
    }

    average=sum/counter;

    if(average>0 )
    {
        GREEN_LED_ON;
        RED_LED_OFF;
    }else{
        GREEN_LED_OFF;
        RED_LED_ON;
    }


}