This happens all the time. What is worse is someone minting someone else's art, and then the buyers starts posting takedown requests to the original artist. Amongst others, this happened to Simon Stålenhag of Tales from the Loop fame...
This happens outside of NFTS, this happens with everything, US dollars, physical contracts, licenses. They can all be faked. NFTs actually do a better job at allow people to identify fakes, lmao. Do better research.
There is nothing wrong with my research. I reported a fact. OP explains how NFT doesn't solve these problems. But it also confuses a lot of people about what it means to own something.