page with multiple loops

Hi all,
I’m working on a page with twoo loops, the first is the default loop managed by the theme, the second one is a custom loop to load a custom post type.

The second loop ignores my custom post type and loads the default post types.

There is some hooks in customizr that change WP_Query arguents?

The code for secondo loop is:

$columns = 3;
            $query_vars = array(
                'post_type'=>'attrazioni',
                'category_name'=>'home',
                'posts_per_page'=>10
            );

            $my_loop = new WP_Query($query_vars);
            $i=1;
            while ($my_loop->have_posts()) : $my_loop->the_post();
                //insert section every four structures
                if($i==1) {?> <section class="row-fluid grid-cols-3"> <?php } $i++; ?>
                    <article class="span4 hot-category-article">
                        <a href="<?php $my_loop->the_permalink(); ?>" rel="bookmark" title="<?php $my_loop->the_title_attribute(); ?>">
                            <div class="hot-category-image" style="background-image: url('<?php $my_loop->the_post_thumbnail_url(); ?>')!important";>
                                <?php //the_post_thumbnail(); ?>
                            </div>
                        </a>
                        <h2><a href="<?php $my_loop->the_permalink(); ?>" rel="bookmark" title="<?php $my_loop->the_title_attribute(); ?>"><?php $my_loop->the_title(); ?></a></h2>
                        <div class="hot-category-excerpt hidden-sm hidden-xs"><?php $my_loop->the_excerpt(); ?></div>
                    </article>
                <?php if($i == $columns + 1) { ?>
                </section>
                <?php $i=1;  ?>
                <?php }
            endwhile;