WP_Query is breaking ACF the_field

I have an issue where Advanced Custom Fields are not displaying after my WP_Query code. I believe the issue is here

<?php $casestudy = new WP_Query( 'post_type=case_studies&posts_per_page=5' ); ?>
            <?php while ( $casestudy->have_posts() ) : $casestudy->the_post(); ?>
                <div class="col-xs-12 col-sm-3 col-md-15">
                    <div class="slideWork">
                        <a href="<?php the_permalink(); ?>">
                            <?php if (has_post_thumbnail()) {
                                 echo'<a href="';
                                 the_permalink();
                                 echo '">';
                                 the_post_thumbnail('case-study2');
                                 echo'</a>';
                            } ?>
                            <div class="slideUpWork">
                                <h4><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></h4>
                                <p><?php the_excerpt(); ?></p>
                                <a class="btn btn-default btn-sm" href="<?php the_permalink(); ?>">view project</a>
                            </div>
                        </a>
                    </div>
                </div>
            <?php endwhile; ?>

I am a front end person, not great with PHP.

The site is local, so you can’t view the issue, but you can view the page code here: https://bitbucket.org/snippets/niki_sebi/y8ALo