Aight so I had some bets on satoshidice that got double spended which I tried to solve in another thread. I tried to move my funds to my backup wallet and but couldn't send 15 btc at once so I sent 3x5 transactions. I checked the backup wallet and all of a sudden I had 4 transactions so I had 20 BTC. I was confused and tried to send back 20 to the same place the 15 came from, and expected an error message or something. But instead a transaction of 19.99 btc went away to my old adress but now THAT transactions says double spend.

 Have i just lost 20 btc or is there any way to solve this?

The transaction hasch for the 20 btc: https://blockchain.info/sv/tx/d1509597829860a9a1f59dcf9408697a6baefcc53fafd1bc288ad8f6539f4848