Arduino DUE I/O trigger problem

I uploaded this in Arduino DUE but it seems that the up and down button is not properly triggering the Arduino DUE pins.

I dont know if there is a problem in the board, but when i tried this one in Arduino Atmega, it is working properly.

#include <LiquidCrystal.h>

LiquidCrystal lcd(2, 3, 4, 5, 6, 7); //Pines arduino a lcd

//Counter to change positions of pages

int page_counter = 1 ;     //To move beetwen pages
int break_counter_pin36 = 0;
int break_counter_pin38 = 0;

//Variables for auto scroll
unsigned long previousMillis = 0;
unsigned long interval = 10000; //Desired wait time 10 seconds

//-------Pins-----//
int up = 8;               //Up button
int down = 9;           //Down button
int up1 = 36;
int up2 = 38;

const int counter = 13;
int hits = 0;
int hits1 = 0;

int switchState = 0;
int prevSwitchState = 0;
//---------Storage debounce function-----//
boolean current_up = LOW;
boolean current_up1 = LOW;
boolean current_up2 = LOW;
boolean last_up = LOW;
boolean last_up1 = LOW;
boolean last_up2 = LOW;
boolean last_down = LOW;
boolean current_down = LOW;


void setup() {

 lcd.begin(16, 2);
}



//---- De-bouncing function for all buttons----//
boolean debounce(boolean last, int pin)
{
 boolean current = digitalRead(pin);
 if (last != current)
 {
   delay(5);
   current = digitalRead(pin);
 }
 return current;
}


void loop() {

 current_up = debounce(last_up, up);         //Debounce for Up button
 current_up1 = debounce(last_up1, up1);         //Debounce for Up button
 current_up2 = debounce(last_up2, up2);         //Debounce for Up button
 current_down = debounce(last_down, down);   //Debounce for Down button

 //----Page counter function to move pages----//

 //Page Up
 if (last_up == LOW && current_up == HIGH) {
   lcd.clear();                     //When page is changed, lcd clear to print new page
   if (page_counter < 4) {           //Page counter never higher than 4(total of pages)
     page_counter = page_counter + 1; //Page up

   }
 }

 last_up = current_up;

 if (last_up1 == LOW && current_up1 == HIGH && page_counter==1 && break_counter_pin36 == 0) {
   lcd.clear();                     //When page is changed, lcd clear to print new page
   if (page_counter < 4) {           //Page counter never higher than 4(total of pages)
     page_counter = page_counter + 1; //Page up
     break_counter_pin36 = break_counter_pin36 +1;

   }
 }

 last_up1 = current_up1;

 if (last_up2 == LOW && current_up2 == HIGH && break_counter_pin38 == 0) {
   lcd.clear();                     //When page is changed, lcd clear to print new page
   if (page_counter < 4) {           //Page counter never higher than 4(total of pages)
     page_counter = page_counter + 1; //Page up
     break_counter_pin38 = break_counter_pin38 +1;
   }
 }

 last_up2 = current_up2;

 //Page Down
 if (last_down == LOW && current_down == HIGH) {
   lcd.clear();                     //When page is changed, lcd clear to print new page
   if (page_counter > 1) {           //Page counter never lower than 1 (total of pages)
     page_counter = page_counter - 1; //Page down

   }
   else {
     page_counter = 4;             //return to page 4
   }
 }

 last_down = current_down;



 //------- Switch function to write and show what you want---//
 switch (page_counter) {

   case 1: {    //Design of home page 1
       lcd.setCursor(2, 0);
       lcd.print("Bending Test");
       lcd.setCursor(4, 1);
       lcd.print("Counter");

     }
     break;

   case 2: { //Design of page 2
       lcd.setCursor(2, 0);
       lcd.print("1st Breakage");
       lcd.setCursor(4, 1);
       lcd.print(hits);
       switchState = digitalRead(counter);
       if (switchState != prevSwitchState) {
         if (switchState == LOW) {
           hits = hits + 1;
           lcd.setCursor(2, 0);
           lcd.print("1st Breakage");
           lcd.setCursor(4, 1);
           lcd.print(hits);

         }
       }
       prevSwitchState = switchState;
     }
     break;

   case 3: {   //Design of page 3
       lcd.setCursor(2, 0);
       lcd.print("2nd Breakage");
       lcd.setCursor(4, 1);
       lcd.print(hits1);
       switchState = digitalRead(counter);
       if (switchState != prevSwitchState) {
         if (switchState == LOW) {
           hits1 = hits1 + 1;
           lcd.setCursor(2, 0);
           lcd.print("2nd Breakage");
           lcd.setCursor(4, 1);
           lcd.print(hits1);

         }
       }
       prevSwitchState = switchState;
     }
     break;

   case 4: {   //Design of page 4
       lcd.setCursor(2, 0);
       lcd.print("(2) samples");
       lcd.setCursor(2, 1);
       lcd.print("was finished");

     }
     break;

 }//switch end

}//loop end

Please disregard this post, I already have a solution.