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The problem is finally resolved. We rewrote some main content on the homepage + changed the menu, so the 2 websites look different now. We had to wait again a few weeks for Google to update, but since today, it's back ok. Thanks for the help.

Thanks for your help. It's strange that the fr. is even working. That should not work, I wrote it in my previous message, but the . was the end of my sentence I don't think that could be the problem, but it's good to know and to fix it anyway!