AJAX pagination offset returns same post on adjacent pages

Solved it with:

function myedit_posts_orderby($orderby_statement) {
    $orderby_statement = "wp_postmeta.meta_value+0 DESC, wp_posts.post_date DESC";
    return $orderby_statement;
}

add_filter('posts_orderby', 'myedit_posts_orderby');
WP_Query...

…for some reason WP_Query only applied DESC order to date, and not to meta value.