One of the payments that I didn't authorize was sent here
1sMMXF8kHWZBVQz3aamyD1tiYixCw1ARu
What the hell happened?
EDIT:I use blockchain
I think it is change address. The coins is still in your wallet, check all your recieving address
If your money not in your wallet "maybe" you're wrong sending it, Trying to check this address : 1sMMXF8kHWZBVQz3aamyD1tiYixCw1ARu in Blockchain your receiving address list
Can you post here the transaction id?
The one I authorized
https://blockchain.info/tx/504658563f231e71f79312e96da2cc13e779875ac262269b1b8f9f04e527dfc9
The one I didn't
https://blockchain.info/tx/d0ca4ac1d4866486424c5239cdfc2565a37cdd401ccd586998614e4bfd440344
Try looking under your archived addresses. It is hard to accidentally send to 2 addresses at once unless one is a change address.