This appears to be a phishing attack: https://twitter.com/cyphreth/status/1495206957589925892 https://twitter.com/0xfoobar/status/1495208279210876930

Example attacker transaction: https://ethtx.info/mainnet/0x18c0b67adf306b7f0da948e238c1397...

We see that this tx performs 3 layers of delegation, whereas normally the opensea WyvernExchange contract needs 2 (user's proxy delegates action to WyvernAtomicizer, which performs the transfer.) In this case there's another layer: user proxy delegates to attacker contract 0xa2c0946ad444dccf990394c5cbe019a858a945bd, which then calls the Atomicizer to do a malicious transfer.