Sounds like you are growing Mexican Sunflower (Tithonia Rotundifolia) and what you describe is perfectly normal. If you prune off the faded flowers, along with the stalk, your plants will develop more flowers. If you leave them on, they will develop seeds (which you can save and plant next year) but since it takes a lot of energy for a plant to set seeds, it may not bloom again for you. Hope this clarifies things for you.
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