Need help with single.php

For some reason when I click on a post and I’m not logged in, the page gets screwed up. But when logged in, it’s all fine.
Please I need some help fixing this issue
example https://www.facethemusik.net/2008/03/05/new-theme/

<?php get_header(); ?>
<div id="text">
	<?php if (have_posts()) : ?>
	<?php while (have_posts()) : the_post(); ?>
	<div class="post" id="post-<?php the_ID(); ?>">
	<div class="posttop"><div class="postdate"><div class="dateday"><?php the_time('d') ?></div><div class="datemonth"><?php the_time('M') ?></div><div class="dateyear"><?php the_time('Y') ?></div></div>
    <div class="pub"><h2><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title(); ?>"><?php the_title(); ?></a></h2>
  	<div class="postedby">posted by <span class="authora"><?php the_author() ?></span></div><div class="fileunder">file under <?php the_category(', ') ?></div> <div class="editbutton"><?php edit_post_link('Edit'); ?></div></div>
    <div class="cleaner"></div>
    </div>

	<?php the_content('Read the rest of this entry &raquo;'); ?>
</div>
	<?php endwhile; ?>
<div id="nav">
<div class="alignleft"><?php next_posts_link('&laquo; Previous Entries') ?></div>
<div class="alignright"><?php previous_posts_link('Next Entries &raquo;') ?></div>
</div>
<?php comments_template(); ?>
	<?php else : ?>
		<h2>Not Found</h2>
		<p>Sorry, but you are looking for something that isn't here.</p>

<?php endif; ?>
</div>
<?php get_sidebar(); ?>
<?php get_footer(); ?>