language switching

I am building my second website using polylang free. It is not live yet. I made multilangual pages and menu’s. But every time moving from on page language thru switching for anothe language, it does not go to the some page in the other language, but to the home page of the selected language. Once in the new language I can use the full menu in that language, but still not switching languages between pages. On my first website this works ok, but I cannot find the difference with my new website. Wat have I missed?