Help Run once in loop

Need help with this code!
It prints
11_1
12_1
In the serial monitor

for (int port = 2; port <= 12; port++)
  {
    if (digitalRead(port) != DigitalInOld[port]) {
      DigitalInOld[port] = digitalRead(port);  // save the changed value
      Serial.print(port);
      Serial.print("_");
      Serial.print(digitalRead(port));
      Serial.print("\n");
      delay(5);
    }
  }

This code is not working either.
It writes:
inc5000
spd1100
fed0110

If i turn the potentiometers it still sends every loop

  if (switchPosition != switchPositionOld) {
    switchPositionOld        = switchPosition;  // save the changed value
    Serial.print(mode        + mod + linebreak);
    //Serial.println(Switch1 + switchPosition + Switch2 + switchPositionOld);

  }
  if (switchPosition1 != switchPosition1Old) {
    switchPosition1Old = switchPosition1;  // save the changed value
    Serial.print(spd + jog_speed + linebreak);
    Serial.print(fed + feed + linebreak);
  }

Full code!

#include <Wire.h>
#include <Adafruit_MCP23017.h>
#include <SoftwareSerial.h>
Adafruit_MCP23017 mcp1;
Adafruit_MCP23017 mcp2;
String jog_speed;
String feed;
String mode;
String mod = "";
String linebreak = "\n";
String spd = "spd";
String fed = "fed";
int switchPosition ;
int switchPosition1;
int switchPositionOld;
int switchPosition1Old;
int DigitalInOld[11];
int mcp1_DigitalInOld[16];
int mcp2_DigitalInOld[16];
// predef
void sendCommand(char);
// the setup routine runs once when you press reset:
void setup() {
  // initialize serial communication at 9600 bits per second:
  Serial.begin(9600);
  for (int port = 2; port <= 12; port++) {
    pinMode(port, INPUT_PULLUP);
    DigitalInOld[port] = 1;
  }
  //Wire.setClock(400000L)
  mcp1.begin(0);      // Default device address 0 = 0x20   1 = 0x21
  mcp2.begin(1);      // Default device address 0 = 0x20   1 = 0x21
  for (int p = 0; p < 16; p++)
  {
    mcp1.pinMode(p, INPUT);
    mcp1.pullUp(p, HIGH);    // Pulled high to ~100k
    mcp2.pinMode(p, INPUT);
    mcp2.pullUp(p, HIGH);    // Pulled high to ~100k
    mcp1_DigitalInOld[p] = 1;
    mcp2_DigitalInOld[p] = 1;
  }
}
String mess1 = "1_";
String mess2 = "2_";
String mess3 = "Port ";
String mess4 = "Av/på ";
// the loop routine runs over and over again forever:
void loop() {

  checkPorts();
  potentiometerSettings(analogRead(A0), analogRead(A1));
  if (Serial.available()) {
    char input = Serial.read();
    //sendCommand(input);
  }
}
void checkPorts()
{
  for (int port = 2; port <= 12; port++)
  {
    if (digitalRead(port) != DigitalInOld[port]) {
      DigitalInOld[port] = digitalRead(port);  // save the changed value
      Serial.print(port);
      Serial.print("_");
      Serial.print(digitalRead(port));
      Serial.print("\n");
      delay(5);
    }
  }

  for (int p = 0; p < 16; p++)
  {
    if (mcp1.digitalRead(p) != mcp1_DigitalInOld[p]) {
      mcp1_DigitalInOld[p] = mcp1.digitalRead(p);  // save the changed value
      Serial.print(mess1 + p);
      Serial.print("_");
      Serial.print(mcp1.digitalRead(p));
      Serial.print("\n");
      delay(5);
    }
    if (mcp2.digitalRead(p) != mcp2_DigitalInOld[p]) {
      mcp2_DigitalInOld[p] = mcp2.digitalRead(p);  // save the changed value
      Serial.print(mess2 + p);
      Serial.print("_");
      Serial.print(mcp2.digitalRead(p));
      Serial.print("\n");
      delay(5);
    }
  }
}



void potentiometerSettings(int sensorValue, int sensorValue1)
{




  //---------------------Potentiometer1---------------------
  if (sensorValue >= 0 && sensorValue <= 255) {
    switchPosition = 10; //10.00
    mode = "inc";
    mod = "5000";
  }
  else if (sensorValue > 255 && sensorValue <= 350) {
    switchPosition = 9;//1.00
    mode = "inc";
    mod = "1000";
  }
  else if (sensorValue > 350 && sensorValue <= 439) {
    switchPosition = 8; //100
    mode = "inc";
    mod = "0500";
  }
  else if (sensorValue >= 439 && sensorValue <= 526) {
    switchPosition = 7; //10
    mode = "inc";
    mod = "0100";
  }
  else if (sensorValue > 526 && sensorValue <= 614) {
    switchPosition = 6; // 1
    mode = "inc";
    mod = "0050";
  }
  else if (sensorValue > 614 && sensorValue <= 704) {
    switchPosition = 5; // 1
    mode = "inc";
    mod = "0010";
  }
  else if (sensorValue > 704 && sensorValue <= 800) {
    switchPosition = 4; //Jog på
    mode = "inc";
    mod = "0005";
  }
  else if (sensorValue > 800 && sensorValue <= 896) {
    switchPosition = 3; //MDI
    mode = "mdi";
    mod = "9000";
  }
  else if (sensorValue >= 896 && sensorValue <= 983) {
    switchPosition = 2; //manual
    mode = "man";
    mod = "9000";
  }
  else if (sensorValue > 983 && sensorValue <= 1050) {
    switchPosition = 1; //Auto
    mode = "aut";
    mod = "9000";
  }

  //---------------------Potentiometer2---------------------(0-100%
  if (sensorValue1 >= 0 && sensorValue1 <= 271) {
    switchPosition1 = 15; //110%
    jog_speed = "1100";
    feed = "0110";
  }
  else if (sensorValue1 > 271 && sensorValue1 <= 327) {
    switchPosition1 = 14; //100%
    jog_speed = "1000";
    feed = "0100";
  }
  else if (sensorValue1 > 327 && sensorValue1 <= 383) {
    switchPosition1 = 13;
    jog_speed = "0900";
    feed = "0095";
  }
  else if (sensorValue1 >= 383 && sensorValue1 <= 436) {
    switchPosition1 = 12;
    jog_speed = "0800";
    feed = "0090";
  }
  else if (sensorValue1 > 436 && sensorValue1 <= 490) {
    switchPosition1 = 11;
    jog_speed = "0700";
    feed = "0085";
  }
  else if (sensorValue1 > 490 && sensorValue1 <= 544) {
    switchPosition1 = 10;
    jog_speed = "0600";
    feed = "0080";
  }
  else if (sensorValue1 > 544 && sensorValue1 <= 595) {
    switchPosition1 = 9;
    jog_speed = "0500";
    feed = "0075";
  }
  else if (sensorValue1 > 595 && sensorValue1 <= 647) {
    switchPosition1 = 8;
    jog_speed = "0400";
    feed = "0070";
  }
  else if (sensorValue1 >= 647 && sensorValue1 <= 700) {
    switchPosition1 = 7;
    jog_speed = "0300";
    feed = "0060";
  }
  else if (sensorValue1 > 700 && sensorValue1 <= 756) {
    switchPosition1 = 6;
    jog_speed = "0200";
    feed = "0050";
  }
  else if (sensorValue1 > 756 && sensorValue1 <= 812) {
    switchPosition1 = 5;
    jog_speed = "0100";
    feed = "0040";
  }
  else if (sensorValue1 > 812 && sensorValue1 <= 866) {
    switchPosition1 = 4;
    jog_speed = "0050";
    feed = "0030";
  }
  else if (sensorValue1 > 866 && sensorValue1 <= 920) {
    switchPosition1 = 3;
    jog_speed = "0025";
    feed = "0020";
  }
  else if (sensorValue1 >= 920 && sensorValue1 <= 987) {
    switchPosition1 = 2;
    jog_speed = "0012";
    feed = "0010";
  }
  else if (sensorValue1 > 987 && sensorValue1 <= 1050) {
    switchPosition1 = 1;//2%
    jog_speed = "0006";
    feed = "0010";
  }
  //                       print out the value you read:
  String                   Switch1 = "Switch1: ";
  String                   Switch2 = "     Switch1Old: ";
  //Serial.println(Switch1 + switchPosition);
  //Serial.println(Switch2 + switchPosition1);
  if (switchPosition != switchPositionOld) {
    switchPositionOld        = switchPosition;  // save the changed value
    Serial.print(mode        + mod + linebreak);
    //Serial.println(Switch1 + switchPosition + Switch2 + switchPositionOld);

  }
  if (switchPosition1 != switchPosition1Old) {
    switchPosition1Old = switchPosition1;  // save the changed value
    Serial.print(spd + jog_speed + linebreak);
    Serial.print(fed + feed + linebreak);
  }

  //Serial.println(sensorValue1);
  delay(5);        // delay in between reads for stability
}

Which Arduino board are you using?

Explain what you are trying to do... (and you don’t need an int to store HIGH or LOW (a bit or byte would do) and if you have buttons, you should handle bouncing as what you print might not be what you used to run the comparison with the old value)

Strings cause the standard Arduino to run out of memory and crash.