Articles on site not displaying in proper / default order

Hi,

I am new to WordPress.

Does anyone know what might cause posts not to display in the default reverse-chronological order?

For example, on the dashboard, the articles are displayed in proper order:

Article A
Published: July 1

Article B
Published: June 1

Article C
Published: May 1

But on the site, they display as follows:

Article B
Published: June 1

Article C
Published: May 1

Article A
Published: July 1

I am using the following code for the loop:

<div id="articles-container">

<?php
$article_args = array( 'category__and' => array( 65, 3 ),'posts_per_page' => 50, 'post_type' => 'post');
$article_query = new WP_Query( $article_args );
if (have_posts()):
while ( $article_query->have_posts() ) : $article_query->the_post();
$permalink = get_permalink();
?>
<article class="single-article">
<h3><a href="<?php echo $permalink; ?>"><?php the_title(); ?></a></h3>
<div id="article-date"><?php the_date('M j, Y', '<p>', '</p>'); ?></div>
<?php the_excerpt(); ?>
</article>
<?php endwhile; else: ?>
<h4>There are currently no articles that fall under this category.</h4>
<?php endif;
wp_reset_postdata();
?>

</div>

I have tried deactivating some plugins that I thought might be causing a problem. Didn’t make a difference.

Thank you for any help you can provide.