lcd.clear() stopped working when I added two more sensors???

my project is to have 4 DHT11 running, connected to an lcd screen. there is a push button that will change between the sensors. The program was working before I added the two extra sensors. Now the program will keep running the cases without clearing the screen.???

#include "DHT.h"
#define DHTPIN 2
#define DHTPIN 3
#define DHTPIN 12;
#define DHTPIN 9;
#define DHTTYPE DHT11
DHT dht1(2, DHT11);
DHT dht2(3, DHT11);
DHT dht3(12, DHT11);
DHT dht4(9, DHT11);
#include <LiquidCrystal.h>
const int rs = 12, en = 11, d4 = 7, d5 = 6, d6 = 5, d7 = 4;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
const int button = 8;
int buttonState = 0;
int count = 0;
void setup() {

  pinMode(button, INPUT);
  dht1.begin();
  dht2.begin();
  dht3.begin();
  dht4.begin();
  lcd.begin(16, 2);


}

void loop() {
  buttonState = digitalRead(button);

  float h1 = dht1.readHumidity();
  float f1 = dht1.readTemperature(true);
  float h2 = dht2.readHumidity();
  float f2 = dht2.readTemperature(true);
  float h3 = dht3.readHumidity();
  float f3 = dht3.readTemperature(true);
  float h4 = dht4.readHumidity();
  float f4 = dht4.readTemperature(true);


  if (buttonState == HIGH) {

    delay(100);
    count++;
  }
  if (count > 4) {
    count = 0;
  }


  switch (count) {


    case 0:
      lcd.clear();
      lcd.print("marks cloaca");
      lcd.setCursor(0, 0);
      delay(100);
      break;


    case 1:

      lcd.clear();

      lcd.setCursor(0, 0);
      lcd.print("T ");
      lcd.print(f1);
      lcd.setCursor(0, 1);
      lcd.print("H ");
      lcd.print(h1);
      delay(100);
      break;


    case 2:
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("T ");
      lcd.print(f2);
      lcd.setCursor(0, 1);
      lcd.print("H ");
      lcd.print(h2);
      delay(100);
      break;


    case 3:
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("T ");
      lcd.print(f3);
      lcd.setCursor(0, 1);
      lcd.print("H ");
      lcd.print(h3);
      delay(100);
      break;


    case 4:
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("T ");
      lcd.print(f4);
      lcd.setCursor(0, 1);
      lcd.print("H ");
      lcd.print(h4);
      delay(100);
      break;




  }
}

What is connected to pin 12 ?

Do you have a pulldown resistor (10k) connected from pin 8 (button) to GND?