On the advise of Robert and Pieter I rewrote the loops using WP_Query instead of query_posts. It works now. Thanks guys.
Here’s the code:
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<li class="tab-link current" data-tab="tab-1">Most Popular</li>
<li class="tab-link" data-tab="tab-2">Recent</li>
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<div id="tab-1" class="tab-content current">
<div class="slider">
<div class="slide">
<?php
$count = 0;
$query = new WP_Query(
array(
'meta_key' => 'post_views_count',
'orderby' => 'meta_value_num',
'order' => 'DESC',
'post_type' => 'atls_video',
'posts_per_page' => '-1'
) );
while ( $query->have_posts() ) : $query->the_post();
$count++; ?>
<?php if ($count%6== 0) : ?>
<div class="video-entry m-all t-1of2 d-1of3 cf">
<div class="video-thumb">
<a href="https://wordpress.stackexchange.com/questions/172351/<?php the_permalink(); ?>"><?php the_post_thumbnail( 'video-thumb' ); ?></a>
</div>
<div class="video-text">
<a href="https://wordpress.stackexchange.com/questions/172351/<?php the_permalink(); ?>" class="title"><?php the_title(); ?></a>
<a href="https://wordpress.stackexchange.com/questions/172351/<?php the_permalink(); ?>" class="read-more">Read More</a>
</div>
</div>
</div>
<div class="slide">
<?php else : ?>
<div class="video-entry m-all t-1of2 d-1of3 cf">
<div class="video-thumb">
<a href="https://wordpress.stackexchange.com/questions/172351/<?php the_permalink(); ?>"><?php the_post_thumbnail( 'video-thumb' ); ?></a>
</div>
<div class="video-text">
<a href="https://wordpress.stackexchange.com/questions/172351/<?php the_permalink(); ?>" class="title"><?php the_title(); ?></a>
<a href="https://wordpress.stackexchange.com/questions/172351/<?php the_permalink(); ?>" class="read-more">Read More</a>
</div>
</div>
<?php endif; ?>
<?php endwhile; ?>
<?php wp_reset_postdata();?>
</div>
<div style="clear:both;"></div>
</div>
</div>
<div id="tab-2" class="tab-content">
<div class="slider">
<div class="slide">
<?php
$count = 0;
$query = new WP_Query(
array(
'orderby' => 'date',
'order' => 'DESC',
'post_type' => 'atls_video',
'posts_per_page' => '-1'
) );
while ( $query->have_posts() ) : $query->the_post();
$count++; ?>
<?php if ($count%6== 0) : ?>
<div class="video-entry m-all t-1of2 d-1of3 cf">
<div class="video-thumb">
<a href="https://wordpress.stackexchange.com/questions/172351/<?php the_permalink(); ?>"><?php the_post_thumbnail( 'video-thumb' ); ?></a>
</div>
<div class="video-text">
<a href="https://wordpress.stackexchange.com/questions/172351/<?php the_permalink(); ?>" class="title"><?php the_title(); ?></a>
<a href="https://wordpress.stackexchange.com/questions/172351/<?php the_permalink(); ?>" class="read-more">Read More</a>
</div>
</div>
</div>
<div class="slide">
<?php else : ?>
<div class="video-entry m-all t-1of2 d-1of3 cf">
<div class="video-thumb">
<a href="https://wordpress.stackexchange.com/questions/172351/<?php the_permalink(); ?>"><?php the_post_thumbnail( 'video-thumb' ); ?></a>
</div>
<div class="video-text">
<a href="https://wordpress.stackexchange.com/questions/172351/<?php the_permalink(); ?>" class="title"><?php the_title(); ?></a>
<a href="https://wordpress.stackexchange.com/questions/172351/<?php the_permalink(); ?>" class="read-more">Read More</a>
</div>
</div>
<?php endif; ?>
<?php endwhile; wp_reset_postdata();?>
</div>
<div style="clear:both;"></div>
</div>
</div>