it's a bug of double-spend when making transaction.

It's important to note this is not a Bitcoin bug.

yeah i'm wrong to call it's a bug because i have no idea to call what it's but i see negative balance several times on Coinbase or Blockchain.info and i think that it happen when making double-spend transaction.
I try to find more and here sthing i got https://support.coinbase.com/customer/portal/articles/1392064-why-do-i-have-a-negative-balance-