Problème avec les mot-clés dans LrC

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Google translation: "I assign a keyword, which I had previously created in LrC to a RAW photo (for example: "Cat") and when I export the photo to create a JPG version, following the export LrC created a new keyword "Cat" at the root of my keyword list. So here I am with two “Cat” keywords in my list. The RAW photo is linked to the first keyword while the JPG photo is linked to the keyword automatically created by LrC."

I think your Export settings include the option Add To This Catalog, so the exported JPEG is reimported into the catalog.

In the Keyword List, right-click the top-level "Nature" keyword and do Edit Keyword Tag. If Include On Export is unchecked, that would cause the behaviour you're seeing:

In that case, when LR exports the keyword "Chat", it doesn't include the parent keyword "Nature". When it imports the exported JPEG back into the catalog, it contains just "Chat" but not its parent keyword "Nature", so it creates a keyword "Chat" at the top level.

The same thing could happen if the keyword "Chat" doesn't have Export Containing Keywords checked.