Sorting Posts by Vote Count

I am using the following code, to show the posts in vote count order.

<?php
/**
 * SORTS THE POSTS BY VOTE COUNT
 */
add_filter('posts_orderby', 'edit_posts_orderby');
add_filter('posts_join_paged','edit_posts_join_paged');

function edit_posts_join_paged($join_paged_statement) {
    global $wpdb;
    $join_paged_statement = "LEFT JOIN ".$wpdb->prefix."wpv_voting ON ".$wpdb-       >prefix."wpv_voting.post_id = $wpdb->posts.ID";
    return $join_paged_statement;
}

function edit_posts_orderby($orderby_statement) {
    global $wpdb;
    $orderby_statement = "(".$wpdb->prefix."wpv_voting.vote_count) DESC";
    return $orderby_statement;
}
?>

It works fine for the listing page. But when I go to a category, it doesn’t show any result.

Please help.

http://wordpress.org/extend/plugins/wp-voting/