I have spoted and reported this for months ago, and still having problem, did you update the osclass to 4.3 and then see robots.txt
even google indexed the OC-admin. with no-follow and disabled at the robots.
add this code into head in item page
<?php if($itemviewer == 0) { ?>
<meta name="robots" content="index, follow" />
<meta name="googlebot" content="index, follow" />
<?php } else if($itemviewer == 1) { ?>
<meta name="robots" content="noindex, nofollow" />
<meta name="googlebot" content="noindex, nofollow" />
<?php } ?>and change code or remove it as it is not needed in head.php
<?php if(!osc_is_search_page()) { ?>
<meta name="robots" content="index, follow" />
<meta name="googlebot" content="index, follow" />
<?php } ?>to
<?php if(!osc_is_search_page() && !osc_item()) { ?>
<meta name="robots" content="index, follow" />
<meta name="googlebot" content="index, follow" />
<?php } ?>if you removed it dont forget to add in main.php
<meta name="robots" content="index, follow" />
<meta name="googlebot" content="index, follow" />
Regards.