Fehler bei Darstellung bei Related Posts (Plugin)

<?php if (have_posts()) : while (have_posts()) : the_post(); ?>


                <div class="singlepost">


                    <div class="post clearfix" id="post-main-<?php the_ID(); ?>">


                        <?php if ( function_exists('yoast_breadcrumb') ) { yoast_breadcrumb('<p id="breadcrumbs">','</p>'); } ?>


                        <div class="entry">


                            <h1 class="post-title"><a href="<?php the_permalink() ?>" rel="<?php _e("bookmark"); ?>" title="<?php _e("..."); ?> <?php the_title(); ?>"><?php the_title(); ?></a></h1>


                            <?php include (TEMPLATEPATH . '/postinfo.php'); ?>


                            <?php the_content(); ?>


                            <?php the_tags("<p class='tags'><strong>Tags</strong>: ",", ", "</p>"); ?>
                            <p class="cats"><strong>Category</strong>: <?php the_category(', '); ?></p>


                            <?php wp_related_posts(); ?>
                            
                        </div>
                        
                        <?php include (TEMPLATEPATH . '/auth-bio.php'); ?>


                        <?php include (TEMPLATEPATH . '/related.php'); ?>


                    </div>

function wp_get_random_posts ($limitclause="") {
    global $wpdb, $post;
        
    $q = "SELECT ID, post_title, post_content,post_excerpt, post_date, comment_count FROM $wpdb->posts WHERE post_status = 'publish' AND post_type = 'post' AND ID != $post->ID ORDER BY RAND() $limitclause";
    return $wpdb->get_results($q);
}


function wp_random_posts ($number = 10){
    $limitclause="LIMIT " . $number;
    $random_posts = wp_get_random_posts ($limitclause);
    
    foreach ($random_posts as $random_post ){
        $output .= '<li>';
        
        $output .=  '<a href="'.get_permalink($random_post->ID).'" title="'.wptexturize($random_post->post_title).'">'.wptexturize($random_post->post_title).'</a></li>';
    }
    
    $output = '<ul class="randome_post">' . $output . '</ul>';
    
    echo $output;

foreach ($related_posts as $related_post ){
        $output .= '<li>';
        
        if ($wp_rp["wp_rp_thumbnail"]){
            $output .=  '<a href="'.get_permalink($related_post->ID).'" title="'.wptexturize($related_post->post_title).'"><img src="'.get_post_meta($related_post->ID, $wp_rp["wp_rp_thumbnail_post_meta"], true).'" alt="'.wptexturize($related_post->post_title).'" /></a>';
        }
        
        if ((!$wp_rp["wp_rp_thumbnail"])||($wp_rp["wp_rp_thumbnail"] && $wp_rp["wp_rp_thumbnail_text"])){
        
            if ($wp_rp["wp_rp_date"]){
                $dateformat = get_option('date_format');
                $output .= mysql2date($dateformat, $related_post->post_date) . " -- ";
            }
            
            $output .=  '<a href="'.get_permalink($related_post->ID).'" title="'.wptexturize($related_post->post_title).'">'.wptexturize($related_post->post_title).'</a>';
            
            if ($wp_rp["wp_rp_comments"]){
                $output .=  " (" . $related_post->comment_count . ")";
            }
            
            if ($wp_rp["wp_rp_except"]){
                $wp_rp_except_number = trim($wp_rp["wp_rp_except_number"]);
                if(!$wp_rp_except_number) $wp_rp_except_number = 200;
                if($related_post->post_excerpt){
                    $output .= '<br /><small>'.(mb_substr(strip_tags($related_post->post_excerpt),0,$wp_rp_except_number)).'...</small>';
                }else{
                    $output .= '<br /><small>'.(mb_substr(strip_tags($related_post->post_content),0,$wp_rp_except_number)).'...</small>';
                }
            }    
        }
        $output .=  '</li>';