Update to WP and ACF broke my site

Hi I have updated WP and Advanced Custom Fields but I don’t know why few things are broken on few of my pages.
I have updated my Php to 7.0.12 but that’s still broken.

By example, on this page, this should be displaying all programs:
https://www.afxstudentexchange.com/australia/programs/

On the other hand the code is working well here (the header is a ACF fields and it’s displaying):
https://www.afxstudentexchange.com/australia/programs/paris-group-tour/

My code on the broken page https://www.afxstudentexchange.com/australia/programs/
looks like this and it was working fine before. I’m not sure what to do… Do you think you could help?

A big big thanks for anyone who is happy to help!!!!

<?php get_header(); ?>
 
    
     <?php if(have_posts()) : ?>
      <?php while(have_posts()) : the_post(); ?>
      
            <div id="blogSingleLargePage">
            
              <?php $values = get_field('header_page',$post->ID); ?>
             <?php if($values) {?>
                       <img src="<?php the_field('header_page'); ?>" class="headerPage"/>
             <?php } ?>    
            
        <div class="post">
        <h1><?php the_title(); ?></h1>
         <hr/>
 
            <div class="entry">
            <?php the_content(); ?>&nbsp;
                     
  <!-- add matt -->
  
  <div class="tableProgLeft">               
  <table class="tableProgramCat">               
               
              <h3>High school programs details</h3>    
            <hr/>
        
                <?php $args = array ( 'category' => 12, 'posts_per_page' => 20, 'order' => 'ASC');
        $myposts = get_posts( $args );
            
        foreach( $myposts as $post ) :    setup_postdata($post); ?>
               
              <?php if(has_category(3,$post->ID)) {?>
                               
                         
                      <?php if(get_field('header_page',$post->ID)) {?>
                                
                                <tr>
                                    <td class="tableProgramImg" >
                                        <a href="<?php the_permalink(); ?>">
                                        <img src="<?php the_field('header_page'); ?>" class="thumbyProg2"/>
                                        </a>

                                        <a href="<?php the_permalink(); ?>"><strong><?php the_title(); ?></strong><br/>
                                        <?php $excerpt = get_the_excerpt();
                                         echo string_limit_words($excerpt,55); ?>...</a>
                                        
                                    </td>
                                </tr>
                       <?php } ?>

                                            
              <?php } ?>    
        <?php endforeach; ?>

</table>
</div>

The page I need help with: [log in to see the link]