WP Generating exactly 2x the number of pages it should

I’m guessing you’ve seen this before and there is a quick fix. I have a client site generating exactly 2x the number of pages that it should.

My loop is pretty straightforward.

<?php

$paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
$archive = array(
'post_status' => 'publish',
'post_type' => 'post',
'posts_per_page'   => 10,
'order' => 'DESC',
'orderby' => 'post_date',
'paged' => $paged
);

global $posts_query;
$posts_query = new WP_Query( $archive ); ?>

<?php if($posts_query->have_posts()) : while($posts_query->have_posts()) : $posts_query->the_post(); ?>

    <?php // get post format and display template for that format
    if ( !get_post_format() ) : get_template_part('post-formats/format', 'standard');
    else : get_template_part('post-formats/format', get_post_format()); endif; ?>

<?php endwhile; ?>
<?php else : ?>

    <p class="no-posts"><?php _e('Sorry, no posts matched your criteria', 'example'); ?></p>

<?php endif; ?>

<?php if ( !is_singular() && !is_page() ) : ?>
    <aside class="row">
        <div class="<?php foundation_columns(12); ?>">
            <?php wp_pagenavi(); ?>
        </div>
    </aside>
<?php endif; ?>

https://www.ads-software.com/plugins/wp-pagenavi/