Core_Page::instance()->title(implode($pageSeparator, $aTitle));
Core_Page::instance()->description(implode($pageSeparator, $aDescription));
Core_Page::instance()->keywords(implode($pageSeparator, $aKeywords));


поменял помогло все отлично!!!

Core_Page::instance()->title($aTitle[0]);
Core_Page::instance()->description($aDescription[0]);
Core_Page::instance()->keywords($aKeywords[0]);