About a week ago, we noticed are best blue ribbon zucchini producer had made a double zucchini. I thought that it was weird because that plant normally makes normal, delicious zucchini. Its almost as if two small zucchinis are growing together. This hasn't happened to us before and I looked it up on google and found no results. It's an heirloom dark star zucchini. Has this happened to anyone else before, and does anyone know why this happened?