Thanks Jochem for your quick response.
So how to we stop the other language content appear for the Default language site?
As you can see from the following link, the pages from other site is appearing under the main section:
The above screenshot shows two version,
- If Czech language is set as Default then the section start showing other languages overview pages.
- If Czech language is NOT Default then it's shows only the correct Overview page.
Make note that not all the pages shows this issue, it's happening for some pages, for other, it's working fine.