This has happend twice now. I've sent btc to some one and the amount I send is sent in the right amount to the receiver but the balance of my wallet is emptied out in to another wallet address following the chain.
If you didn't make this transaction, your wallet may be compromised.
You can see this from this wallet to see what I'm stating The balance is not returned to any wallet I hold but someone elses
It sounds like TheArchaeologist is correct here - your wallet has been compromised, your deposits are being stolen by a third party, and you are mistakenly believing that they are being sent to a miner to cover the fees.
Immediately the poster say that the balance is send to another address that is not his own. Also he did not off the change address setting of his wallet. And even his transaction do not have change.
That means he is compromised.