Sorry mate, you must have visited a phishing site, like fake MyEtherWallet website and they stole your private key, then logged into your wallet, sent your coins out to another wallet


On a side note - this project I feel is very under rated, they released a demo of the interface software that the nodes will run. I was skeptical of this project at first but after talking with 2 of the devs on their slack I'm optimistic on SUB and got into the ICO at the last minute. I just bought more on EtherDelta before the next 2 coin burns happen (1st was done, 2nd on Oct 4th and the 3rd will be right before they get on a major exchange like Bittrex. They have beta coming out soon and V1 by January which is a lot sooner than many ICO's release products

https://coinmarketcap.com/currencies/substratum/