Hi @fanta00
Please add your code using the code tag so it shows properly. Regarding your issue, I believe you can do something like this:
$wp_query = new WP_Query($args);
?>
<?php while ( $wp_query->have_posts() ) : $wp_query->the_post(); ?>
<?php $top_post_banner = get_field('top_banner', get_the_ID()); ?>
<img src="<?php echo $top_post_banner['sizes']['medium']; ?>" alt="<?php echo $top_post_banner['alt']; ?>" />
<?php endwhile; ?><!– end of the loop –>
<?php wp_reset_query(); ?>
I hope this helps.