Hello,
this is the first report of such a behavior. Can you send screen shots of your parameters? Do you have any URL I can look at?

Thank you for the screenshots. I don't see anything wrong in the way you set the module up.
To be frank, if you already have a problem on a standard Joomla! module like 'Latest News', the problem probably comes from some configuration that has nothing to do with the modules. Check the database and see if you have unique articles to start with. Maybe there is a problem due to internationalization of the articles. How are your articles organized? Different categories for different languages? This is where I would look first.