Filter for table admin of a custom post does not work correctly

I have created a custom post and I have added two new fields (year, month) and a filter for each of those fields. The thing is that if I filter by one (year or month) and I give the filter button it filters me well and if I then add the second filter and filter it, it passes me. And if I put the two filters from the beginning and give it to filter it does not work either.

This is the code of one of the filters, I do not put the two because they are the same except for the name of the select.

//crea el filtro select encima de la tabla
function year_admin_posts_filter_restrict_manage_posts(){
    global $wpdb;
    $type = 'post';

  if(isset($_GET['post_type'])) {
      $type = $_GET['post_type'];
  }

  if( $type == 'custom-post' ){
        $values = $wpdb->get_results( "SELECT DISTINCT meta_value FROM ".$wpdb->prefix."postmeta WHERE meta_key = '_year_field'");
    ?>
    <select name="admin_filter_year">
            <option value=""><?php _e('Filter by: Year', 'mgm'); ?></option>
        <?php $current_v = isset($_GET['admin_filter_year'])? $_GET['admin_filter_year']:'';
                foreach ($values as $value) {
                    $s = ($value->meta_value == $current_v)? 'selected="selected"':'';
                    echo '<option value="'.$value->meta_value.'" '.$s.'>'.$value->meta_value.'</option>';
        }
        ?>
    </select>
<?php }
}
add_action( 'restrict_manage_posts', 'year_admin_posts_filter_restrict_manage_posts' );


//Filtro para mostrar por pantalla el listado resultante de la seleccion de select anterior creada
function audience_year_posts_filter( $query ){
    global $pagenow;
    $type = 'post';

    if(isset($_GET['post_type'])) {
        $type = $_GET['post_type'];
    }

    if( $type == 'channel' && is_admin() && $pagenow=='edit.php' && isset($_GET['admin_filter_year']) && $_GET['admin_filter_year'] != '') {
        $query->query_vars['meta_key'] = '_year_field';
        $query->query_vars['meta_value'] = $_GET['admin_filter_year'];
  }
}
add_filter( 'parse_query', 'audience_year_posts_filter' );