post__in doesn't work in custom Page template

Hi,

I have a problem with a loop that I try to put into a custom Page template. I would like to display posts with conditions, but whatever I put in my WP_query parameters, it is not taking in consideration.

Here is all my template code:

<?php
    /*
    Template Name: Trends
    */

    get_header(); ?>

    <section id="top">
        <?php the_post(); ?>
        <div class="intro"><?= get_the_title(); ?></div>
        <?php the_content();?>			

    <?php
    $args = array(
    	'posts_per_page' => 2
    );

    $latest = new WP_Query( $args ); ?>
    <?php while( $latest->have_posts() ) : $latest->the_post(); ?>
        <h2><?php the_title(); ?></h2>
    <?php endwhile; wp_reset_postdata(); ?>
    </section>

    <?php get_footer(); ?>

This code gives me all my posts, and not only the 2 I asked on args. But whatever I put it always gives me the default loop…

I’ve tried everything and I still don’t understand.

If notice that this works:

$query = new WP_Query(array(
	'p' => 42
));

But if I use something else in my WP_Query like that:

$query = new WP_Query(array(
	'post__in' => array(42,55,34),
        'post_status' => 'publish',
	'ignore_sticky_posts' => false,
	'orderby' => 'post__in',
	'posts_per_page' => 2
));

It always display all my posts.

Thanks for your help!