Problem solved, thanks to the Supoort Team!
If someone else got this Problem here is the reason and the Solution:
It is a common SEO mistake that a lot of sites may experience that both www and non www versions are accesible.
For any web tool and search engines, www and non www versions are different pages, so we coded our tool to work like the standard.
To correct this you should choose what version of your site do you want (with or without www) and then use a redirection. That redirection will automatically redirect you to the chosen page.
You can check this to better understanding:
Creating a redirection should be easy, but it depends on your hosting provider. It is usually done using a .htaccess file in your main FTP folder.
Some info about htaccess redirection: