Quote from: Chillin_with_beer on April 10, 2014, 06:13:33 AM

It's a new address, owned by your own client.
bitcoin-qt uses a previous incoming transaction to spend on a new transaction. If you send less, you will receive change in a new address. If a hacker got access to your wallet, it would be empty.

Your QT client used this transaction:
https://blockchain.info/tx/d34f3da4776d2511d4ca207f7f2b64ee0fbbee787cebdd4ce9ff6b30bac08790

to spend on your last transaction. The change (849 mBTC) got sent to a new address, owned by your own client.
This is why your QT client displays the correct balance, but the blockchain of your 'main' wallet address doesn't.

see also here:
http://bitcoin.stackexchange.com/questions/9007/why-are-there-two-transaction-outputs-when-sending-to-one-address

Wait so does that mean I'm all good? The problem was I've been trying to send bitcoins while my client isn't synced up so I've been checking the blockchain to see if it was all good and I noticed that transaction an started shitting my pants, because it's not synced up I didn't think I'd see a change in the balance