Just as a suggestion to prevent this from happening in the future, set up a task "Planting Corn" for corn and another "Planting Soybeans" for beans rather than just using a task called Planting and depending on that. Otherwise, what happens is if you are using the same task and you come back in the same field to plant beans where you were planting corn before, it will switch the crop back over to corn without asking or making you aware it has done so.