Duplicated nodes of thew view
I can suggest you an alternative approach.
In your views filter area, create a new filter, based on the current user's language.

How to do it:

Views: add filter criteria -> Content: Translation language
Check the checkbox labeled "Interface text language selected for page"


Another thing, you can go to Views overview page, and then Views settings tab -> Show SQL query option.

How to do it:

Go to admin/structure/views/settings
Check this option

In this way this will always show the query that gets executed.
I suggest you copy it it here, so that the other people will have better time understanding what you want to achieve.

Notes:
The Drupal 7 site builders are used to "Currents user language" checkbox, however that checkbox has been renamed.
More information:
http://hojtsy.hu/comment/21596#comment-21596

Best regards,
Oleg