这里发生的是你正在设置$landscape 在循环之前，因此只设置一次。（因此它会显示在循环中的每个项目中。）

要解决此问题，请移动第五行-$landscape - 在回路内部。

<?php 
    $args = array( \'post_type\' => \'products\', \'posts_per_page\' => 9 );
    $the_query = new WP_Query( $args );
    // No longer setting $landscape here, which only sets it once.
?>

<main class="site-content">
    <div class="row">

        <?php if ( $the_query->have_posts() ) : ?>
            <?php while ( $the_query->have_posts() ) : $the_query->the_post();
            // Landscape now pulls for the current post.
            $landscape = get_field(\'main_photo_landscape\', $post->ID);
        ?>

                <article class="col-12 col-md-6 col-lg-4 product">
                    <a href="<?php the_permalink(); ?>" title="<?php the_title_attribute(); ?>">
                        <div class="featured-img" style="background: url(\'<?php echo $landscape[\'sizes\'][\'large\']; ?>\') center center no-repeat; background-size: auto 100%"></div>
                        <h1 class="title"><?php the_title(); ?></h1>
                        <button class="btn">More Details</button>
                    </a>
                </article>

            <?php endwhile; ?>

            <?php the_posts_navigation(); ?>

        <?php endif; ?>

    </div>
</main>