Did you download some software that isn't familiar to you? maybe a malware was installed on your PC. And the amount that was sent to that address was already traded on hitbtc.
If you didn't do that transaction, you should transfer all the other balances to another wallet.
If you didn't do that transaction, you should transfer all the other balances to another wallet.
but I have too much game assets
Metamask instantly integrates with many sites and you might have pushed the submit button as the address and amount are already filled by the site while you only need to push the submit button. It may also be hacked by someone/some adware recording your screen or your keystrokes. Or you could also be using a counterfeit metamask if you didn't downloaded it from the chrome webstore.
