The same issue that led to OpenSea paying out $1.8 million to users who lost their NFTs is apparently still alive and well (despite OpenSea’s introduction of an “Inactive listings” panel). Users who have listed NFTs for sale and never removed the listing have occasionally been surprised in a very bad way when their NFT suddenly sells for an old price — sometimes much different than the going prices for those NFTs.In this case, a person successfully sold their Pudgy Penguin NFT for 8.69 ETH a year ago ($27,500 at the time of sale). Those particular NFTs have been having a comeback lately, and so the collector bought the same NFT back — this time for 20 ETH ($31,500 at the time of sale). However, an old listing from their previous ownership was still active, and someone was able to snap up the NFT from them for only 9.89 ETH ($15,600) within minutes.The collector’s near-instantaneous $20,000 loss has a happy ending for them, though — the person who bought the NFT was willing to reverse the trade.