There are always orangutans that come back regularly to the centers from which they were released in order to find food. Gante, as well as other released orangutans, can be dangerous if they are hungry and searching for food. The workers and the volunteers all have to stay back and keep a good distance away from her.
I thought these are good pictures to describe why orangutans come back to the center. The picture above is of Gante looking for food. The picture below is her leaving the center and going back to the jungle.