I'm a little puzzled with a transaction that took place from my qt-wallet.

This link shows the transaction on the blockchain: https://chainz.cryptoid.info/dash/tx.dws?1999511.htm

What I don't understand is where this ~18.39 Dash amount came from.  I sent 20 Dash to the address listed on Index item 1. I approved 20 Dash plus the small fee to be withdrawn from my qt-wallet. Definitely did NOT approve 38.39288666 DASH to be withdrawn and I've not set any payments out that were there previously and didn't go out.

The ~18.39 is sitting unredeemed according the transaction record. Have I lost it? Does anyone have any idea what is going on here? The ~38.39 definitely came out of my balance.