default language by polylang plugin not working

I installed Polylang Plugin and configed that but I have a problem when I set the default language in Persian language the site loaded in English mode and it is not deference if change default language because in any way in run site loaded by English version. I installed 3 languages: Persian, English, French Wordpress version is 4.1.1 and Polylang Plugin version is 1.8.5 How can I fixed the default language in fa-IR? please help me

via Chebli Mohamed