WP_Query loop duplicates posts by the numbers of posts (3 posts = 9)

<?php

$args = array(
    'post_type' => 'projects'
);

// the WP_Query
$project = new WP_Query( $args );

if ( $project->have_posts() ) {
    // start the loop
    while ( $project->have_posts() ) {
        $project->the_post();
        $terms = get_the_terms( $post->ID, 'typologi' );

        // since get_the_terms returns WP_Term and only the slugs are needed
        $terms_only_slugs = array_map( function( $term ) {
        return $term->slug;
        }, $terms );

        // when multiple terms set make it a string
        $element_item_classes = implode( ' ', $terms_only_slugs );

        // pass the string as an attribute
        echo '<div class="element-item ' . $element_item_classes . '">';

        the_post_thumbnail( array(600, 600) ); // size: 600x600px
        the_title( sprintf( '<h3 class="item-title"><a href="%s" rel="bookmark">', esc_url( get_permalink() ) ), '</a></h3>' ); ?>
        <h5><?php echo get_the_term_list( $post->ID, 'typologi', 'Typologi: ', '', '' ); ?></h5><?php

        echo '</div>';
    }
}
wp_reset_postdata();
?>