Custom Field Isn't Displaying

Hi,

In my footer I use this code:

<?php
$posts = get_posts('cat=5&numberposts=3');
foreach ($posts as $post) : start_wp(); ?>
<li><a href="<?php the_permalink(); ?>">
<?php the_post_thumbnail('thumbnail'); ?>
<?php
$postid = $wp_query->post->ID;
echo get_post_meta($postid, 'Short Teaser', true);
?></a></li>
<?php
endforeach;
?>

Notice after the thumbnail, I’m pulling in a custom field called Short Teaser. This works on every page (though I’ve had previous issues). But on one of my category pages changing:

<?php if ( have_posts() ) : ?>

to

<?php if ( have_posts() ) : query_posts($query_string."&posts_per_page=2&paged=$paged"); ?>

By doing this, it means on this page it prevents the custom field from showing (thumbnail still displays). Anyone know how I can avoid this? I presume I can pull in the custom field in some other way to stop avoid the clashes I keep getting at every corner.

Thanks!
Matt