Wrong results for search query

Sorry this was my fault i had code in my functions.php causing this

function SearchFilter($query) {
     if ($query->is_search) {
     $query->set('post_type', 'page');
     }
    return $query;
}
add_filter('pre_get_posts','SearchFilter');

I fixed the issue using a better code below

function exclude_all_pages_search($query) {
    if ( $query->is_main_query() && $query->is_search() && ! is_admin() ) {
        $query->set('post_type', array( 'post', 'advert' ) );
    }
}
add_action('pre_get_posts','exclude_all_pages_search');

Hi,
ok thanks for the feedback, i am marking this thread as resolved then.