that’s certainly Cryptokitties to type of the token first.
but there's another so-called type ERC721 or based name NFTs (non-fungible token). I more interest was like 0xcert and MANA, Developer project is actives in development also on media channels.

nope, it’s not a bug or change called type tokens. So the function is much different, need was briefly of all the Tokens based on ERC20-23 it’s referred as to Fungible Token But it's the exact opposit type Token ERC721 as name Non-fungible Token or NFT

Well, etherscan currently was supports tracker Token ERC721 check here
and also check here for NFTs
an other is a reference to us efforts to understand and know about ERC721, check here