Krumbach: Milk doesn't fit anywhere! We bought the biggest Valtra Tractor and planted Cornfield.

The secret of what happened after episode 17 is that the game crashed and the whole save was lost, with nothing left. I rebuilt everything from scratch, including the farm, machines, store amounts, and field states as close to the original as possible. Did you notice anything different? I was able to do it by watching videos from earlier in the game.