Editing attachment page

I have an amended attachment page using a child theme. The image on the attachment page appears twice, and I cannot see why this is happening (it looks like it is a featured image on a post page along with the ‘normal’ image appearing below it).

How can I edit the attachment.php page to remove the duplicate image? Below is the attachment.php

<?php
/**
 * The Template for displaying all single posts.
 *
 * @package GeneratePress
 */
 
// No direct access, please
if ( ! defined( 'ABSPATH' ) ) exit;

get_header(); ?>

	<div id="primary" <?php generate_content_class();?>>
		<main id="main" <?php generate_main_class(); ?>>
		<?php do_action('generate_before_main_content'); ?>
		<?php while ( have_posts() ) : the_post(); ?>
<?php echo wp_get_attachment_link( $attachment->ID, 'full'); ?>

			<?php get_template_part( 'content', 'single' ); ?>
<?php
	if (function_exists('exifography_display_exif'))
		echo exifography_display_exif();
?>
			<?php
				// If comments are open or we have at least one comment, load up the comment template
				if ( comments_open() || '0' != get_comments_number() ) : ?>
					<div class="comments-area">
						<?php comments_template(); ?>
					</div>
			<?php endif; ?>

		<?php endwhile; // end of the loop. ?>
		<?php do_action('generate_after_main_content'); ?>
		</main><!-- #main -->
	</div><!-- #primary -->

<?php 
do_action('generate_sidebars');
get_footer();

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