Thanks for the tag! Reused Content is not about Copyright (or permission, or fair use, etc) and is separate from YouTube’s Copyright enforcement – it’s part of the Content Quality section of YPP policies. More info and best practices here: https://yt.be/help/reused-content …
Update – estimated revenue in YouTube Analytics may differ from finalized payments due to final adjustments and is modified at the end of the month to match. The fluctuations you are seeing are likely due to this adjustments. More info here: https://yt.be/help/xtg8