Why the Paagination show more links than content ?

Dear friends,
In my category news page I have done a pagination link. But it show more links than the actual content . So goto 404 page. How it can avoid . My code is

 <?php
/**
 * The template for displaying the news category listing page
 *
 * @package WordPress
 * @subpackage Insight_Custom
 * @since Insight Custom 1.0
 */
get_header(); 

$dd = get_query_var('paged');
//echo "page is ".$dd;
$_GET['sa'] = ($dd == 0)?$_GET['sa']:0;
//print_r($_GET);
?>
    <div class="spotlight"> <img src="<?php bloginfo('template_directory'); ?>/media/spotlight/spotlight-inner-01.jpg" alt="Inner spotlight" title="spotlight of inner page" border="0"  /> </div>
    <div class="content grid_12">
      <h2 style="color: #0b669b;">News Listing</h2>
      <div class="line"></div>
       <?php
       $categories = get_the_category();
       $cat = $categories[0]->term_id;
       $paged = ( get_query_var( 'paged' ) ) ? absint( get_query_var( 'paged' ) ) : 1;
       
       if($_GET['sa'] == 1){
         $ppp = -1;
       }else{
         $ppp = 4;
       }
       $args = array(
         'posts_per_page' => $ppp,
         'paged' => $paged,
         'cat' => $cat
       );
       query_posts($args);
       while (have_posts()) :
       the_post(); ?>
       <h3 style="color: #0b669b"><?php the_title(); ?></h3>
       <?php
        the_content();
       ?>
       
      <?php endwhile;
       ?>
      <div align="center">
      <?php
      
      $big = 999999999; // need an unlikely integer
      echo paginate_links( array(
   'base' => str_replace( $big, '%#%', esc_url( get_pagenum_link( $big ) ) ),
   'format' => '?paged=%#%',
   'current' => max ( 1, get_query_var('paged') )
   //'total' => 2000
 ) );
      ?>
     <?php if($ppp == 2) { ?>
     <span style="padding-left: 14px;"> <a href="<?php echo home_url();?>/category/news/?sa=1" style="color:#3B5998">Show all</a> </span>
      <?php } else { ?>
      <span style="padding-left: 14px;"> <a href="<?php echo home_url();?>/category/news/" style="color:#3B5998">Show less</a> </span>
      <div class="col-md-12 back-to-top">
        <a href="#top"> <img src="<?php bloginfo('template_directory'); ?>/media/images/backtop.png" alt="Get to the top"></a>
        <p class="back-text">Get to the top</p>
      </div>
      <?php } ?>

      </div>
     
     </div>

 
    </div>
     <?php get_sidebar(); ?>
    <br  clear="all" />
  </div>
  <!-- End Container -->
</div>
<?php get_footer (); ?> 

Please advise

Waiting for fast reply

Thanks
Anes