Output Buffering Fix

<?php if (have_posts()) : while (have_posts()) : the_post(); ?>
<h1><?php the_title(); ?></h1>

ob_start();
[tab name='Overview']
    <div id="product-image"><?php the_post_thumbnail(); ?></div>
    <?php the_field('overview'); ?>
[/tab]
[tab name='Features & Benefits']
    <?php the_field('features_&_benefits'); ?>
[/tab]
[tab name='Options & Accessories']
    <?php the_field('options_&_accessories'); ?>
[/tab]
[tab name='Downloads']
    <a href="<?php the_field('downloads'); ?>">Download PDF</a>
[/tab]
[tab name='Supplies']
    <?php the_field('supplies'); ?>
[/tab]
[end_tabset]
$output_buffer = ob_get_contents();
ob_end_clean();
echo do_shortcode( $output_buffer );