Litecoinj transaction sent to unknown address I have used litecoinj-core-0.15 to generate a transaction to address MD1AYTZnTtGKQToj2LTD7qLsSzrqcdXr9J.

Litecoinj generated a transaction with two outputs. The first one (to LaPJ9TfBr6E2MSRa4t1MMhFPQAue4osUn8) corresponds to the change address. The second one is an address that I cannot understand the origin: LQKxaEyD3XLZmbXYyVna9aoJBzLxAhNS4S. I have tried to find it in the list of refund, change, receive_fund, and authorisation addresses of the Wallet and could not find it there.

Could someone explain from where is this address coming?

Kind regards, and thank you in advance,
António.
I looked into this by converting the addresses from base 58 to hex. What I got was this:
MD1AYTZnTtGKQToj2LTD7qLsSzrqcdXr9J -> 0x3237fb62589f848d3808f0b9bfe9762edabe150b93f409d315
LaPJ9TfBr6E2MSRa4t1MMhFPQAue4osUn8 -> 0x3037fb62589f848d3808f0b9bfe9762edabe150b93bab51bf3

Notice that the positions from byte 1 to byte 20 are the same: 37fb...0b93. 

This is unfortunately bad news and means that the software you are using is bad.

The address that starts with M or 3 in Litecoin are pay-to-script-hash addresses (P2SH) and the software should have created P2SH outputs but it has for some reason instead created pay-to-public-key-hash outputs (P2PKH) as you can see here: 

{
          "value": 15149,
          "script": "76a914a64e3a77893db78edfb3ba4abfa2106f84ba80eb88ac",
          "addresses": [
            "LaPJ9TfBr6E2MSRa4t1MMhFPQAue4osUn8"
          ],
          "script_type": "pay-to-pubkey-hash"
        },

The funds you have sent are unfortunately lost and you should stop using this software immediately since it only seems to support P2PKH addresses and not P2SH addresses.

If it is any comfort, you are not the first one to make this mistake.