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You frequently see this when buying bulbs packaged this way. At some point they have become warm enough to sprout. Since an eye has already developed a stalk, it is best to plant it with the stalk upward. The spot where the stalk meets the bulb should be a good 3 inches below ground levelr ground to provide some support to keep the stalk from drooping over in a rain or a stiff breeze. The stalk will continue to grow upward. Other eyes may develop as well and will find their own way above ground. They are very forgiving.
Hope your dahlias turn out to be a beautiful addition to your garden. They are one of my favorites