Bug with ACF

<?php
/**
 * The Template for displaying all single posts
 *
 * @package WordPress
 * @subpackage Kleo
 * @since Kleo 1.0
 */
 acf_form_head(); ?>
<?php get_header(); ?>

<?php
//Specific class for post listing */
if ( kleo_postmeta_enabled() ) {
	$meta_status = ' with-meta';
	if ( sq_option( 'blog_single_meta', 'left' ) == 'inline' ) {
		$meta_status .= ' inline-meta';
	}
	add_filter( 'kleo_main_template_classes', create_function( '$cls','$cls .= "' . $meta_status . '"; return $cls;' ) );
}

/* Related posts logic */
$related = sq_option( 'related_posts', 1 );
if ( ! is_singular('post') ) {
    $related = sq_option( 'related_custom_posts', 0 );
}
//post setting
if(get_cfield( 'related_posts') != '' ) {
	$related = get_cfield( 'related_posts' );
}
?>

<?php get_template_part( 'page-parts/general-title-section' ); ?>

<?php get_template_part( 'page-parts/general-before-wrap' );?>

<?php /* Start the Loop */ ?>
<?php while ( have_posts() ) : the_post(); ?>

<div class="row">
  	<div class="col-md-3"><?php the_post_thumbnail('medium'); ?></div>
  	<div class="col-md-3">
	  	<h1 class="H1withoutTopMargin" style="
	    margin-top: 0px;"><?php the_field( 'acfArtistes_nomArtiste' ); ?></h1>
	    <div class="social">
			<ul class="menu simple rdo-social">
				<?php if( get_field('acfArtistes_facebook') ): ?>
					<li><a href="<?php echo the_field('acfArtistes_facebook'); ?>"><i class="gplus"></i></a></li>
				<?php endif; ?>
				<?php if( get_field('twitter') ): ?>
					<li><a href="<?php echo the_field('twitter'); ?>"><i class="fa fa-twitter"></i></a></li>
				<?php endif; ?>
				<?php if( get_field('linkedin') ): ?>
					<li><a href="<?php echo the_field('linkedin'); ?>"><i class="fa fa-linkedin"></i></a></li>
				<?php endif; ?>
				<?php if( get_field('instagram') ): ?>
				        <li><a href="<?php echo the_field('instagram'); ?>"><i class="fa fa-instagram"></i></a></li>
				<?php endif; ?>
				<?php if( get_field('github') ): ?>
					<li><a href="<?php echo the_field('github'); ?>"><i class="fa fa-github"></i></a></li>
				<?php endif; ?>
				<?php if( get_field('dribbble') ): ?>
					<li><a href="<?php echo the_field('dribbble'); ?>"><i class="fa fa-dribbble"></i></a></li>
				<?php endif; ?>
				<?php if( get_field('behance') ): ?>
					<li><a href="<?php echo the_field('behance'); ?>"><i class="fa fa-behance"></i></a></li>
				<?php endif; ?>
			</ul>
		</div>
		<div>	
			<section class=activityArtiste>
				<p>Activité : 
				<?php // acfArtistes_Activity
				$field = get_field_object( 'acfArtistes_Activity' );
				$value = $field['value'];
				$choices = $field['choices'];
				if ( $value ):
					foreach ( $value as $v ):
						echo $choices[ $v ];
					endforeach;
				endif; ?>	
			</section>
			<section class='pays'>
				<?php //Fonction Uppercase premier lettre : http://php.net/manual/fr/function.ucfirst.php
				$country = get_field('pays');
				$country = ucfirst($country); ?>
				<p>Pays : <?php echo $country; ?></p>
			</section>
			<section class="birthdayArtiste">
				<!-- https://www.gregoirenoyelle.com/acf-creer-une-date-intertionalisable/ -->
				<?php
				$date_d = get_field('acfArtistes_Birthday');

				// Extraire Y,M,D
				$Y = substr($date_d, 0, 4);
				$M = substr($date_d, 4, 2);
				$d = substr($date_d, 6, 2);

				// Créer le format UNIX
				$time_d = strtotime("{$d}-{$M}-{$Y}");
				?>
				<p>Né le : <?php echo date('d', $time_d); ?> <?php echo date_i18n('M', $time_d); ?> <?php echo date('Y', $time_d); ?>
				</p> 	
			</section>
		</div>
    </div>
  	<div class="col-md-3">
  		<h1 class="H1withoutTopMargin">Label</h1>
		<?php
			$posts = get_field('acfArtistes_label');

			if($posts): 
		?>
		<section class="LabelsListe">
			<ul>
				<?php 
					foreach( $posts as $post): // ne pas changer $post IMPORTANT
						setup_postdata($post); 
				?>

				<li>
					<?php the_post_thumbnail( array(80, 80) ); ; //https://developer.wordpress.org/reference/functions/the_post_thumbnail/?>
					<a href="<?php the_permalink(); ?>"><?php the_title(); ?></a>
				</li>

				<?php endforeach; ?>
			</ul>
		</section>

<?php 
		wp_reset_postdata(); // IMPORTANT - réinitialiser l'objet $post sur la requête principale
	endif; 
?>
  	</div>
</div>

	<div class="col-md-6 col-sm-12 backOrange">dddd</div>
	<div class="col-md-6 col-sm-12 backGreen">ddd</div>
</div>

<div>
	<p>My custom field: <?php the_field('acfArtistes_Birthday'); ?></p>						
    <?php get_template_part( 'content', get_post_format() ); ?>
</div>
<?php acf_form(); ?>

        <!-- Begin Comments -->
        <div class="aligncenter">
			<h4 class="titleComments">Une question, une remarque, un avis ?</h4>
			<h4>Laissez nous un commentaire.</h4>
		</div>
    <?php
	if ( comments_open() || get_comments_number() ) {
		comments_template( '', true );
	}
	?>
    <!-- End Comments -->

		<?php get_template_part( 'page-parts/posts-social-share' ); ?>

		<?php 
		if( $related == 1 ) {
			get_template_part( 'page-parts/posts-related' );
		}
		?>

		<?php
        if ( sq_option( 'post_navigation', 1 ) == 1 ) :
            // Previous/next post navigation.
            kleo_post_nav();
        endif;
		?>

<?php endwhile; ?>

<?php get_template_part('page-parts/general-after-wrap');?>

<?php get_footer(); ?>