I had an issue with post titles. GD Star was translating the titles.
I found that line 278 at render.php ($rt = str_replace('%TITLE%', __($title), $rt);) was the problem.
I change it to $rt = str_replace('%TITLE%', $title, $rt); and works fine.
My question is: "why we need translation to post title, supposed to be the same to all languages", if we want translation we use a multilanguage plugin like WPML.
In example, my post titles are bussiness names, the name (post title) is the same to every language. But GD Star is translating it be default.