arduino button problems, again

I have a problem with two buttons and a RGB LED. I want the two buttons to be pressed and then the brightness decreases/increases but it isn't working. When i press it, it decreases it but then it doesn't do it again. Any help would be appreciated. Code included below (problem is in bold) :

int button = 8;
int button_two = 7;
int redPin = 6;
int greenPin = 5;
int bluePin = 3;
int val = 0;
int val_two = 0;
int numb = 0;
int r = 0;
int g = 0;
int b = 0;
int i = 0;

void setup() {
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
  pinMode(button, INPUT);
  pinMode(button_two, INPUT);
  Serial.begin(9600);
}
void loop() {
  val = digitalRead(button);
  val_two = digitalRead(button_two);
    if (val == HIGH && val_two == LOW && numb < 7) {
    numb++;
    delay(300);  
  } else if (val_two == HIGH && val == LOW && numb > 1) {
    numb--;
    delay(300);  
  } else {
    numb=numb;
  }
 
  if (numb == 1){
      r = 255;
      g = 255;
      b = 255;
  }

  if (numb == 2){
      r = 255;
      g = 0;
      b = 0;
  }
  if (numb == 3){
      r = 0;
      g = 255;
      b = 0;
  }
  if (numb == 4){
      r = 0;
      g = 0;
      b = 255;
  }
  if (numb == 5){
      r = 255;
      g = 255;
      b = 0;
  }
   if (numb == 6){
      r = 255;
      g = 0;
      b = 255;
  }
   if (numb == 7){
      r = 0;
      g = 255;
      b = 255;
  }

  if (val == HIGH && val_two == HIGH) {
 
    int r_cal = r / 5;
    int g_cal = g / 5;
    int b_cal = b / 5;
   
    r = r - r_cal;
    g = g - g_cal;
    b = b - b_cal;

  Serial.println(r);
  Serial.println(g);
  Serial.println(b);

  delay(300);
  } else {
    val == LOW;
    val_two == LOW;
  }

  analogWrite(redPin, r);
  analogWrite(greenPin, g);
  analogWrite(bluePin, b);
}