tag.php not working (gets one tag but not any other)

Hi!
So a have some tags at my site with some post_types and a tag.php page, the problem is: one of the tags shows normally (tag_id = 18) but any other ones doesn’t show in the tag.php page, actually shows a single post from the tag 18 .
the code that gets my tag_id:

<?php get_header();?>
<?php
$posttags = get_the_tags();
if ($posttags) {
  foreach($posttags as $tag) {
    $tagid = $tag->term_id;
	$args=array(
					'post_type' => array('post', 'video', 'lookbook'),
					'tag__in' => array($tagid)
				);
  }
}
				query_posts($args);
?>

BTW taxonomies.php doesn’t work at all, the tags and categories are shared between post and post_types