Try this:
$paged = get_query_var( 'paged' ) ? get_query_var( 'paged' ) : 1;
$args = array(
'posts_per_page' => 5,
'category' => 6,
'order' => 'DESC',
'paged' => $paged,
);
Currently, you are setting The paged
argument to 1
.