[Plugin: WordPress SEO by Yoast] zlib compression code problem

I added this code to my themes header.php file

<?php
ini_set('zlib.output_compression', 'On');
ini_set('zlib.output_compression_level', '1');
?>

Now WordPress SEO is causing my site to double everything

http://stylereaction.com/

Can anyone help with this? My site was running really slow and that code has helped speed.

http://wordpress.org/extend/plugins/wordpress-seo/