Sort the dates within an if - php loop

I am experiencing abnormal behavior of my code, with this query here:

$v_args = array(
    'post_type' => get_option('customer_postquery'),
    'posts_per_page'    => -1,
    'order' => 'ASC',
    'meta_query' => array(
        array (
            'key'       => 'metakey_AMC_data',
        ),
    ),
    'tax_query' => array(
        array(
            'taxonomy' => 'categoria',
            'field' => 'slug',
            'terms' => $queried_object,
        )
    )

);
$vehicleSearchQuery = new WP_Query( $v_args );

I take out all the posts of all my custom post types that belong to a given taxonomy.

But if I only have a custom post type it works perfectly if I adjust more than one bust all the dates:

if( $vehicleSearchQuery->have_posts() ) :
    while( $vehicleSearchQuery->have_posts() ) : $vehicleSearchQuery->the_post();
       ?>
        <?php
        $var = get_post_meta(get_the_ID(),'metakey_AMC_data',true);
        $data_dell_evento = date("Y-m-d", strtotime( $var ));

        /*PRENDERE LA DATA CORRENTE IN FORMATO Y-m-d DIRETTAMENTE DA MYSQL*/
        $data_di_oggi = date( 'Y-m-d', current_time( 'timestamp', 0 ) );
        if ($data_dell_evento > $data_di_oggi   ): ?>

            <div style="padding-top: 25px;" class="col-md-4"><!-- Card -->
                <?php include('content/home_page/card.php');  ?>
            </div>

        <?php  endif; ?>

    <?php
    endwhile;
else :
    ?>

<?php
endif;
wp_reset_postdata();
?>

if I do echo of the variable: $data_dell_evento, i have this:

2019-09-01
2019-09-02
2019-09-30
2019-10-03
2019-10-01
2019-10-01

begin error

2019-10-10
2019-10-08
2019-10-04

why do i have this sort?