Once a goal moved to a day, cannot remove it from the day
1. Create a new goal.
2. Move that goal to a day. The task is for some reason now duplicated in goals and schedule.
3. Try to move the goal from the schedule back to the goals list (to remove it from a date) - now there are duplicates in the goals list.
4. Delete one of the duplicates but then they both disappear and you need to re-create.
If you move a goal to a day, it is still a goal, and therefore shows in both places.
To remove it from the day, open the Edit dialog and click on the "Remove from Week" button.
I will have a look at the issue where a goal gets duplicated if you move it back to Goals.