This thread is resolved. Here is a description of the problem and solution.
Problem: On my website I have a 2 languages. Dutch (primary lang.) & French (secondary lang.)
On the dutch menu, everything works fine.
On the French however I have some troubles. When I click on a tab forexample 'qui sommes-nous' it redirects me to the primary language (dutch) homepage.
Solution: I edited the French version of the page and added the ID in French (qui sommes-nous) that was missing and then fixed the URL in the custom link on the Menu.
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