Page ordering not working on live page

Hi,

I found a custom child pages code from this forum that allows to display the featured image and first couple of sentences of child pages on the parent page. It’s working beautifully, but I can’t seem to get the page ordering to work. Does anyone notice the flaw here?

<?php
/*
Template Name: Child pages
*/

 get_header();?>
  <div id="main">
		<div id="maintext">
      <?php if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>

			<header class="entry-header">
				<h1 class="entry-title"><?php the_title(); ?></h1>
			</header>

			<div class="entry-content" style="clear:both;">

				<?php the_content(); ?>

				<?php
				$args = array(
					'post_parent' => $post->ID,
					'post_type'   => 'page',
					'post_status' => 'publish',
					'numberposts' => -1
				);

				$postslist = get_posts($args);
				?>

				<?php foreach ( $postslist as $post ) : ?>

					<?php setup_postdata( $post ); ?>

					<div class="project">

					<a href="<?php the_permalink(); ?>" style="float:left; padding: 0px 15px 0px 0px;"><?php if( has_post_thumbnail() ) the_post_thumbnail('Project'); ?></a>

					<div class="project-meta">
						<h2><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></h2>

					</div><!-- project-meta -->

					<div class="project-summary">
						<?php the_excerpt(); ?>
					</div><!-- project-summary -->

					</div><!-- project -->

				<?php endforeach; ?>

			</div><!-- entry-content -->

		<?php endwhile; endif; ?>
       </div><!-- end of maintext -->
		</div><!-- end of main -->
		<?php get_sidebar();?>
		<?php get_footer();?>