Washing machine ?

We have the LG steam washer (2009); the one with the more square door. I tried to use the custom program yesterday, and the machine ran the cycle I asked, and then automatically started an 18 HOUR long washing cycle. (Yes, I caught it before it ran that long!) I thought maybe it was a fluke, so tried it again today and the same thing happened. Anybody have any clue why that would happen?