I do know that Magic Eiden is a reputable platform but I'm not sure what and if something could be wrong with the NFT listing itself... Possibly? I would try and buy another cheap NFT as a test, or try the same nft but different listing if possible. That should give you an idea on what the issue is.
I tried as you said. Then this happened.
trying to buy a different NFT (Frucks #2157) on Magic Eden, and encountering a new error from the OKX Wallet: "This transaction is risky. Multiple inscription assets in use. Proceed with caution.
BTW when the day I received BTC to my wallet, I have received some tokens(I didnt buy) at same time with different values