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Yes. I saw that too. No idea why. Tried fixing all forms of redirects.

I don't see open graph tags in your header. Did you try putting them ? https://developers.facebook.com/docs/reference/plugins/like/ Step 2.

The like button seems to have changed recently, relying only on open graph tags, and not on <title> and others informations.

ah. didn't know that. I have added the tags now. Yet the same thing happens.