Pagination disfunction – Pages show the same posts

I’m running a wordpress site for a client and he recently came up with a problem with the pagination: When you go to the second page of his blog, it shows exactly the same posts as the first page, when it should display older posts.

I tried using 2 different pagination types (wp_pagenavi and twentyeleven) but they both get the same thing.

What could I be doing wrong?

This is what my archive.php looks like:

<?php get_header(); ?>
<div class="content">
		<h1><?php single_cat_title(); ?></h1>
		<?php $currentCat = get_query_var('cat'); ?>
<?php
if(cat_is_ancestor_of(3, $currentCat)) {
} else {
	// The Query
	query_posts( 'cat=-34,-35,-6,' );
}

// The Loop
while ( have_posts() ) : the_post(); ?>

--- the post html ---

<?php endwhile;

// Reset Query
wp_reset_query();
?>
</div>
<?php wp_pagenavi(); ?>
<?php get_footer(); ?>