Quirklings are now only avaliable to be bought or sold on Magic Eden - buys / sells will fail on opensea.

https://magiceden.io/collections/ethereum/0x8f1b132e9fd2b9a2b210baa186bf1ae650adf7ac

10,000 Quirklings, assisting in the fight for peace throughout Quirksville. Quirklings will also provide the ability to determine their guardians Quirksville membership tier.