I encounter some troubles when I do my game design project

Processing Coding Questions
1

I’m new to Processing and I cannot solve the problem below :
In my game, why some of the bullets can smash the meteorites, but some of the bullets cannot?

The code:

PImage mete;
PImage bg;
PImage spship;
PImage bulletB;
int totalNum = 15;
int PlayerW, PlayerH;

float[] x = new float [totalNum];
float[] y = new float [totalNum];
float[] w = new float [totalNum];
float[] h = new float [totalNum];
boolean[] alive = new boolean [totalNum];

int totalNum2 = 30;
float[] bx = new float[totalNum2];
float[] by = new float[totalNum2];
boolean[] visible = new boolean[totalNum2];
int bW = 10;
int bH = 60;

float BLeft;
float BRight; 
float BTop;
float BBottom; 

float meteLeft;
float meteRight; 
float meteTop; 
float meteBottom; 

void setup()
{
  size(800,1000);
  background(255);
  mete = loadImage("meteorite.gif");
   bg = loadImage("galaxy.jpg");
   spship = loadImage("spaceship.png");
   bulletB = loadImage("Bullet_blue.png");
   
   PlayerW = 110;
  PlayerH = 110;
  
  for(int i = 0; i < x.length; i=i+1)
  {
    float scale = random(0.2, 0.3);
    w[i] = mete.width * scale;
    h[i] = mete.height * scale;
    x[i] = random(0, width-w[i]);
    y[i] = random(-1000, -h[i]);
     alive[i] = true;
     }
     
     for(int i = 0; i < visible.length; i=i+1)
  {
    visible[i] = false;
  }
}


void draw()
{
  image(bg, 0, 0, width, height);
 
 for(int i = 0; i < visible.length; i=i+1)
  {
    if(visible[i] == true)
    {
      image(bulletB, bx[i], by[i], bW, bH);
      by[i] = by[i] - 5;
    }
    if(by[i] <= 0)
    {
      visible[i] = false;
    }
  }
  
  drawmeteorite(5, 21, 3);
}




void keyPressed()
{
  if( key == ' ')
  {
   boolean found = false;
   for(int i = 0; i < visible.length; i=i+1)
   {
    if(found == false && visible[i] == false)
    {
     bx[i] = mouseX-5;
     by[i] = mouseY-110/2;
    
     visible[i] = true;
     found = true;
    }
   }
}
}


void drawmeteorite(int lives, int startTime, int speed)
{
  for(int i = 0; i < visible.length; i=i+1) 
  {
    if(visible[i] == true)
    {
    BLeft = bx[i];
    BRight = bx[i] + bW;
    BTop = by[i];
    BBottom = by[i] + bH;
    }
  }
  
  for(int i = 0; i < x.length; i=i+1)
  {
    if(alive[i])
    {
     meteLeft = x[i];
     meteRight = x[i] + w[i];
     meteTop = y[i];
     meteBottom = y[i] + h[i];
     
     if(BTop < meteBottom && meteTop < BBottom && BLeft < meteRight && meteLeft < BRight)
     {
       alive[i] = false;
     }
    }
  }
  
  for(int i = 0; i < x.length; i=i+1)
  {
    if(alive[i])
    {
    image(mete, x[i], y[i], w[i], h[i]);
    y[i] = y[i] + speed;
    
    if(y[i] >= height)
    {
      float scale = random(0.2, 0.3);
      w[i] = mete.width * scale;
      h[i] = mete.height * scale;
      
      x[i] = random(0, width-w[i]);
      y[i] = random(-100, -h[i]);
      
      lives = lives - 1;
    }
    }
  }
 image(spship, mouseX-PlayerW/2, mouseY-PlayerH/2, PlayerW, PlayerH);
  
  fill(255,34, 0);
  textSize(40);
  text("Lives: "+ lives, 20, 50);
  text("Time: "+ (startTime - millis()/1000) + "s", 20, 100);
    
  
}
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