Comments Submitted to Wrong Post

I’ve developed my own theme from scratch.
– New comments are posted to the wrong post.
– And after submitting a new comment visitors are diverted to a different post.

An example of one of my posts is: http://www.truevoyage.com/db/thailand/koh-tao/muay-thai-boxing-training.html

Does anyone know how I can fix this? Thanks in advance.

—
Not sure if this info will help.
I call my comments as part of my footer.php file

<?php $comments_args = array(
        'title_reply'=>'Submit A Comment',
        'comment_notes_after' => '',
	'comment_notes_before' => '');

comment_form($comments_args); ?>

My main index file is very simple [and I don’t use single.php – all posts use the index.php]

<?php get_header(); ?>
<?php if (have_posts()) :
while (have_posts()) :
the_post(); ?>
<?php the_content(); ?>
<?php endwhile; else: ?>
<p>Sorry, no posts we're found.</p>
<?php endif; ?>
<?php get_footer(); ?>

My comments.php looks like this:

<ul style="list-style: none; padding:0; margin:0;">
 <?php wp_list_comments( 'callback=garytheme_comments' ); ?> 

<div class="comments-nav"><?php paginate_comments_links('prev_text= &next_text= ') ?> </div>

Where the function called is in my functions.php file:

function garytheme_comments($comment, $args, $depth) {
		$GLOBALS['comment'] = $comment;
		extract($args, EXTR_SKIP);
?>

<li><div id="div-comment-<?php comment_ID() ?>" class="comment-body">
		<div>
		<div class="comml"><?php printf(__('<cite class="fn">%s</cite>'), get_comment_author_link()) ?></div>
		<div class="commr">Posted <?php comment_date('j-M-Y'); ?></div>
		</div>
<div class="comcom"><?php if ($comment->comment_approved == '0') : ?>
		<em class="comment-awaiting-moderation"><?php _e('Your comment is awaiting moderation.') ?>

<?php endif; ?>
		<?php comment_text() ?></div>
		</div>
<?php
        }

[please remember to mark any posted code – http://codex.ww.wp.xz.cn/Forum_Welcome#Posting_Code – the above codes might be broken/corrupted by the forum parser]