Arduino Project, Multiple Sensors, Menu With Push Button

So I'm working on a project, where I make a water feasibility meter using 3 sensors (temperature, tds, and turbidity), I use arduino uno and i2c LCD (20x4) as the output.

now I'm trying to create menus and submenus that display the results of each sensor, the problem is that when I enter the push button code for the sensor, the result I get is feedback that takes too long, sometimes when the button is pressed it can run the menu and sometimes not (the push button code alone without me entering the sensor code works normally)

can you help me solve this problem?
this is my temporary full sketch

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#include "GravityTDS.h"

LiquidCrystal_I2C lcd(0x27, 20, 4); // Alamat I2C LCD, ukuran 20x4

#define btnBack 7
#define btnOk   6
#define btnDown 5

boolean statusBtnBack = false;
boolean statusBtnOk   = false;
boolean statusBtnDown = false;

boolean statusAkhirBtnBack = false;
boolean statusAkhirBtnOk   = false;
boolean statusAkhirBtnDown = false;

boolean BACK = false;
boolean OK   = false;
boolean DOWN = false;

int halaman  = 1;
int menuItem = 1;

#define ONE_WIRE_BUS 2
#define TdsSensorPin A2
#define TurbiditySensorPin A0

OneWire oneWire(ONE_WIRE_BUS);
GravityTDS gravityTds;
DallasTemperature sensors(&oneWire);

float tdsValue = 0;
float turbidityVolt;
float turbidityNTU;

void setup() {
  Serial.begin(115200);
  lcd.init();
  lcd.backlight();

  pinMode(btnBack, INPUT_PULLUP);
  pinMode(btnOk,   INPUT_PULLUP);
  pinMode(btnDown, INPUT_PULLUP);

  sensors.begin();
  sensors.setResolution(12);
  gravityTds.setPin(TdsSensorPin);
  gravityTds.setAref(5.0);
  gravityTds.setAdcRange(1024);
  gravityTds.begin();
}

void loop() {
  tampil();

  statusBtnBack = digitalRead(btnBack);
  statusBtnOk   = digitalRead(btnOk);
  statusBtnDown = digitalRead(btnDown);

  saatBackDitekan();
  saatOkDitekan();
  saatDownDitekan();

  // Read TDS and Temperature
  sensors.requestTemperatures();
  gravityTds.setTemperature(sensors.getTempCByIndex(0));
  gravityTds.update();
  tdsValue = gravityTds.getTdsValue();

  // Read Turbidity
  turbidityVolt = 0;
  for (int i = 0; i < 800; i++) {
    turbidityVolt += (analogRead(TurbiditySensorPin) / 1023.0) * 5;
  }
  turbidityVolt /= 800;
  turbidityVolt = round_to_dp(turbidityVolt, 2);

  if (turbidityVolt < 2.5) {
    turbidityNTU = 3;
  } else {
    turbidityNTU = -1120.4 * sq(turbidityVolt) + 5742.3 * turbidityVolt - 4353.8;
    turbidityNTU = turbidityNTU / 1000; // dividing by 1000

  }

  // Handle button actions
  if (BACK) {
    BACK = false;
    if (halaman == 2 || halaman == 3 || halaman == 4) {
      halaman = 1;
    }
  }

  if (OK) {
    OK = false;
    if (halaman == 1 && menuItem == 1) {
      halaman = 2;
    } else if (halaman == 1 && menuItem == 2) {
      halaman = 3;
    } else if (halaman == 1 && menuItem == 3) {
      halaman = 4;
    }
  }

  if (DOWN && halaman == 1) {
    DOWN = false;
    menuItem ++;
    if (menuItem > 3)menuItem = 1;
  }

  Serial.println(menuItem);
  delay(100);
}

void saatBackDitekan() {
  if (statusBtnBack != statusAkhirBtnBack) {
    if (statusBtnBack == 0) {
      BACK = true;
    }
    delay(50);
  }
  statusAkhirBtnBack = statusBtnBack;
}

void saatOkDitekan() {
  if (statusBtnOk != statusAkhirBtnOk) {
    if (statusBtnOk == 0) {
      OK = true;
    }
    delay(50);
  }
  statusAkhirBtnOk = statusBtnOk;
}

void saatDownDitekan() {
  if (statusBtnDown != statusAkhirBtnDown) {
    if (statusBtnDown == 0) {
      DOWN = true;
    }
    delay(50);
  }
  statusAkhirBtnDown = statusBtnDown;
}

void tampil() {
  if (halaman == 1) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("SENSOR MENU");

    if (menuItem == 1) {
      lcd.setCursor(0, 1);
      lcd.print("> Temperature");
    } else {
      lcd.setCursor(0, 1);
      lcd.print("  Temperature");
    }

    if (menuItem == 2) {
      lcd.setCursor(0, 2);
      lcd.print("> TDS");
    } else {
      lcd.setCursor(0, 2);
      lcd.print("  TDS");
    }

    if (menuItem == 3) {
      lcd.setCursor(0, 3);
      lcd.print("> Turbidity");
    } else {
      lcd.setCursor(0, 3);
      lcd.print("  Turbidity");
    }
  } else if (halaman == 2) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Suhu: ");
    lcd.print(sensors.getTempCByIndex(0));
    lcd.print(" C");
  } else if (halaman == 3) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("TDS: ");
    lcd.print(tdsValue, 0);
    lcd.print(" PPM");
  } else if (halaman == 4) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Turbidity: ");
    lcd.print(turbidityNTU);
    lcd.print(" NTU");
  }
}

float round_to_dp(float in_value, int decimal_place) {
  float multiplier = pow(10.0, decimal_place);
  in_value = round(in_value * multiplier) / multiplier;
  return in_value;
}

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