[Wordpress] Why does php code output text that it shouldn't?

neformal300, в чём

heavedem,

<div class="menu_tags_category">
<form action="" method="get">
<?php
wp_get_nav_menu_items( $menu, $args = array(
'nopaging' => true,
'post_type' => 'nav_menu_item',
'post_status' => 'publish',
'order' => 'ASC',
'orderby' => 'menu_order',
'output' => ARRAY_A,
'output_key' => 'menu_order',
'update_post_term_cache' => false
));
if( $menu_items = wp_get_nav_menu_items('menu__total_number_of_players') ) {
$menu_list = '';
foreach ( (array) $menu_items as $key => $menu_item ) {
$getID = $menu_item->object_id;
$title = $menu_item->title;
$menu_list .= '<div class="menu_tags_category__element_buttons_btn">'.'<input type="checkbox" name="filter[category][]" id="'.$getID .'"'.'value="'.$getID.'"'.checked((isset($_GET['filter']['category']) && in_array($getID, $_GET['filter']['category'])))
. '>' . '<label for="' . $getID . '">'. $title .'</label></div>';
}
echo $menu_list;
}
?>

<!---->
</div>
<!---->
<!---->
</div>
</div>
<div id="sidebar_container__footer">
<div id="sidebar_container__footer_btn">
<button id="button_submit_filter" type="submit"><p>Отфильтровать</p></button>
</form>
</div>
</div>

HTML

            <div class="menu_tags_category">

                <form action="" method="get">

            <?php

            wp_get_nav_menu_items( $menu, $args = array(

                'nopaging'               => true,

                'post_type'              => 'nav_menu_item',

                'post_status'            => 'publish',

                'order'                  => 'ASC',

                'orderby'                => 'menu_order',

                'output'                 => ARRAY_A,

                'output_key'             => 'menu_order',

                'update_post_term_cache' => false

            ));

            if( $menu_items = wp_get_nav_menu_items('menu__total_number_of_players') ) {

                $menu_list = '';

                foreach ( (array) $menu_items as $key => $menu_item ) {

                    $getID = $menu_item->object_id;

                    $title = $menu_item->title;

                    $menu_list .= '<div class="menu_tags_category__element_buttons_btn">'.'<input type="checkbox" name="filter[category][]" id="'.$getID .'"'.'value="'.$getID.'"'.checked((isset($_GET['filter']['category']) && in_array($getID, $_GET['filter']['category'])))

                    . '>' . '<label for="' . $getID . '">'. $title .'</label></div>';

                }

                echo $menu_list;

            }

            ?>



            <!---->

            </div>

            <!---->

            <!---->

        </div>

    </div>

    <div id="sidebar_container__footer">

        <div id="sidebar_container__footer_btn">

            <button id="button_submit_filter" type="submit"><p>Отфильтровать</p></button>

            </form>

        </div>

    </div>

heavedem, а так на странице

EZTEN10, результат с хтмл старницы скинь