Comments: required fields bug?

Hello, I have a problem with getting my comments form to work.

Every time the user (either logged in or not) tries to post a comment, it returns error “please fill out the name, email, comment” as if the fields were empty.

I’m using comments.php file based on the Starkers theme – full code here: https://pastie.org/452097

The code for the form itself looks like this:

<?php if ('open' == $post->comment_status) : ?>

<h3 id="respond">Leave a Reply</h3>

<?php if ( get_option('comment_registration') &amp;&amp; !$user_ID ) : ?>
<p>You must be <a href="<?php echo get_option('siteurl'); ?>/wp-login.php?redirect_to=<?php echo urlencode(get_permalink()); ?>">logged in</a> to post a comment.</p>
<?php else : ?>

    <form action="<?php echo get_option('siteurl'); ?>/wp-comments-post.php" method="post" id="commentform">
    <fieldset>

    	<?php if ( $user_ID ) : ?>
		<p>Logged in as <a href="<?php echo get_option('siteurl'); ?>/wp-admin/profile.php"><?php echo $user_identity; ?></a>. <a href="<?php echo get_option('siteurl'); ?>/wp-login.php?action=logout" title="Log out of this account">Log out.</a></p>
		<?php else : ?>

    	<label for="name">Name <?php if ($req) echo "<span>(Required)</span>"; ?></label>
    	<input type="text" name="name" id="name" value="<?php echo $comment_author; ?>" tabindex="1" <?php if ($req) echo "aria-required='true'"; ?> />

    	<label for="mail">Mail <span>(will not be published) <?php if ($req) echo "(Required)"; ?></span></label>
    	<input type="text" name="mail" id="mail" value="<?php echo $comment_author_email; ?>" tabindex="2" <?php if ($req) echo "aria-required='true'"; ?> />    	

    	<label for="site">Webiste</label>
    	<input type="text" name="site" id="site" value="<?php echo $comment_author_url; ?>" tabindex="3" />

    	<?php endif; ?>

		<p><strong>XHTML:</strong> You can use these tags: <code><?php echo allowed_tags(); ?></code></p>

    	<label for="comment-text">Comment</label>
    	<textarea name="comment-text" id="comment-text" cols="40" rows="10" tabindex="4"></textarea>

    	<input name="submit" type="submit" id="submit" tabindex="5" value="Submit Comment" />
		<input type="hidden" name="comment_post_ID" value="<?php echo $id; ?>" />
		<?php do_action('comment_form', $post->ID); ?>

    </fieldset>
    </form>

<?php endif; // If registration required and not logged in ?>

<?php endif; ?>

I would be grateful for some help, the project is very urgent so I need to find a solution asap. Thanks in advance!

Justine