Masonary image not positioning correctly on ajax call

I am using https://masonry.desandro.com/ v4.2.2 and the minimal code looks like:

<div class="fk-grid-container" id="ajax-concepts">
<?php
//This is just the wordpress loop and currently its looping and showing 3 items
//LOOP START
while ( $the_query->have_posts() ) :
    $the_query->the_post();
    $thumbnail_url = get_the_post_thumbnail_url('','full');
?>
    <div class="fk-grid-item">
        <a href="<?php echo $thumbnail_url; ?>" class="gallery-link">
            <div
                    class="boxes"
                    data-aos="fade-down"
                    data-aos-duration="2000"
            >
                <div class="images-box">
                    <img
                            src="<?php echo $thumbnail_url; ?>"
                            class="img-fluid"
                            alt="<?php the_title(); ?>"
                    />
                </div>
            </div>
        </a>
    </div>
<?php
//LOOP END
endwhile;
wp_reset_postdata();
?>
</div>

And, I have initalized it as :

jQuery(".fk-grid-container").imagesLoaded(function () {
    jQuery(".fk-grid-container").masonry({
        itemSelector: ".fk-grid-item",
        gutter: 30,
    });
    AOS.refresh();
});

Upto this point its fine, now on click load more, I am making an ajax call and on success it is returning html as:

<div class="fk-grid-item">
   <a href="http://famous.test/wp-content/uploads/2021/08/02.png" class="gallery-link">
      <div class="boxes" data-aos="fade-down" data-aos-duration="2000">
         <div class="images-box"><img src="http://famous.test/wp-content/uploads/2021/08/02.png"  class="img-fluid"  alt="Image 3" /></div>
      </div>
   </a>
</div>
<div class="fk-grid-item">
   <a href="http://famous.test/wp-content/uploads/2021/08/05.png" class="gallery-link">
      <div class="boxes" data-aos="fade-down" data-aos-duration="2000">
         <div class="images-box"><img src="http://famous.test/wp-content/uploads/2021/08/05.png"  class="img-fluid"  alt="Image 2" /></div>
      </div>
   </a>
</div>
<div class="fk-grid-item">
   <a href="http://famous.test/wp-content/uploads/2021/08/06.png" class="gallery-link">
      <div class="boxes" data-aos="fade-down" data-aos-duration="2000">
         <div class="images-box"><img src="http://famous.test/wp-content/uploads/2021/08/06.png"  class="img-fluid"  alt="Image 1" /></div>
      </div>
   </a>
</div>

and my ajax success:

success: function(data){
    var $data = jQuery(data);
    if($data.length){
        jQuery(".fk-grid-container").append(data).masonry( 'reloadItems' );
        AOS.refresh();
    }
},

But, with this code the image are not aligned to correct position and is displayed as:

This is what it looked initially:

What it should look like:

Update:

I have tried with:

var $grid = $('.fk-grid-container');
$grid.masonry()
    .append( $data )
    .masonry( 'appended', $data )
    .layout();
AOS.refresh();

I have tried with above code, it is adding the new content but it is not increasing the height of current container and instead overlapping over next container. With this the load data button is covered by the data so I can't make another request.

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