I am having an issue with my Pagination.

I am here with a new issue i am facing. When i click on page 2, 3 it shows same page. Here are my codes. First. Pagination in functions.php

function pagination($pages = '', $range = 4)
{
     $showitems = ($range * 2)+1;  

     global $paged;
     if(empty($paged)) $paged = 1;

     if($pages == '')
     {
         global $wp_query;
         $pages = $wp_query->max_num_pages;
         if(!$pages)
         {
             $pages = 1;
         }
     }   

     if(1 != $pages)
     {
         echo "<div class=\"pagination\"><span>Page ".$paged." of ".$pages."</span>";
         if($paged > 2 && $paged > $range+1 && $showitems < $pages) echo "<a href='".get_pagenum_link(1)."'>&laquo; First</a>";
         if($paged > 1 && $showitems < $pages) echo "<a href='".get_pagenum_link($paged - 1)."'>&lsaquo; Previous</a>";

         for ($i=1; $i <= $pages; $i++)
         {
             if (1 != $pages &&( !($i >= $paged+$range+1 || $i <= $paged-$range-1) || $pages <= $showitems ))
             {
                 echo ($paged == $i)? "<span class=\"current\">".$i."</span>":"<a href='".get_pagenum_link($i)."' class=\"inactive\">".$i."</a>";
             }
         }

         if ($paged < $pages && $showitems < $pages) echo "<a href=\"".get_pagenum_link($paged + 1)."\">Next &rsaquo;</a>";
         if ($paged < $pages-1 &&  $paged+$range-1 < $pages && $showitems < $pages) echo "<a href='".get_pagenum_link($pages)."'>Last &raquo;</a>";
         echo "</div>\n";
     }
}

Pagination.css

.pagination {
margin-left:40%;
margin-top:-70px;
clear:both;
padding:20px 0;
position:relative;
font-size:14px;
font-weight:bold;
line-height:18px;
}

.pagination span, .pagination a {
display:block;
float:left;
margin: 2px 2px 2px 0;
padding:6px 9px 5px 9px;
text-decoration:none;
width:auto;
color:black;
background:white;
border:2px solid #e8eaeb;
}

.pagination a:hover{
color:black;
background: rgba(144, 150, 154, 0.075);
border:2px solid #e8eaeb;

}

.pagination .current{
padding:6px 9px 5px 9px;
background: rgba(144, 150, 154, 0.075);
color:black;
border:2px solid #e8eaeb;
}

Pagination Loop In Page Where i want to show Pagination

<?php if (function_exists("pagination")) {
    pagination($additional_loop->max_num_pages);
} ?>

Now, The Posts i call to show on page, codes in Functions.php.

$args = array(

    'offset'           => 0,
    'category'         => '',
    'category_name'    => '',
    'orderby'          => 'post_date',
    'order'            => 'DESC',
    'include'          => '',
    'exclude'          => '',
    'meta_key'         => '',
    'meta_value'       => '',
    'post_type'        => 'post',
    'post_mime_type'   => '',
    'post_parent'      => '',
    'post_status'      => 'publish',
    'suppress_filters' => true
);
$posts_array = get_posts( $args );

This one is the Page where i am showing posts..

<?php
query_posts($args); ?>
<?php while (have_posts()) : the_post();

$content = get_the_excerpt();
$content2 = substr($content, 0, 100);

$short_title = the_title('','',false);
$short_title = substr($short_title,0,16);
$id = get_the_ID();

$image = '';

if (has_post_thumbnail( $id ) ): 

$image = wp_get_attachment_image_src( get_post_thumbnail_id( $id ), 'single-post-thumbnail' ); 

endif;

$img = $image[0];

?>

    <div class="singlepost">
    <a href="<?php the_permalink() ?>"><img src="<?php echo $img; ?>"></a>
    <h3 style="margin-left:3%;"><?php echo $short_title; ?></h3>
    <p style="margin-left:3%;"><?php echo $content2; ?>...</p>
    <a href="<?php the_permalink() ?>" class="button" style="margin-left:3%;margin-top:-19px;">Read More →</a>
    </div>

<?php
endwhile;
?>

Please Help me to solve this issue.