pages not linked

Hello I’ve been dealing with an issue and I would love to have your advices . I have installed polyang and set two languages , in my case , English and Greek , also I ‘ve installed duplicate page . I duplicate every page I have in English in Greek I preview them , I have already translated the menus and add the language switcher . The thing is that when I visited my website and for example I am at Home page of the English version and press the switch button I have the Home page of the Greek version then when I press from the menu another choice of the Greek menu it leads me to the correct page but in English if I press the switcher it displays the corresponding Greek . How can I fix this ? Is there any setting , maybe I haven’t link the menus ? because first I translated the menus and then the pages .

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