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As an administrator when I change or edit a post of an author (for example add a category through quick edit) the author of the post changes. We do not want this to happen. Is there a way to prevent this?
Both, quick edit and the regular post edit screen, offer an author field. Just take care to set the correct author when you edit something.
To see this field you have to enable it in the screen option in the upper right corner:
Required, but never shown