Thanks for the screenshot. Try using the steps listed in this Help Center article to remove claimed song from the video: https://yt.be/help/5H7o . Also, clear cache and cookies of the browser before you try them. Hope that helps.
We'd like to help. What exactly is happening when you try editing the content? Do you see a specific error message? If yes, share a screenshot for us to look into this. Keep us posted.
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