
Certified GKH Gardening Expert
This can, sometimes, be attributed to a soil fertility issue. Make sure to test your soil before feeding, and feed tulips often. Here are some articles that will help:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-ph-plants.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm
https://www.gardeningknowhow.com/ornamental/bulbs/tulips/parrot-tulip-bulbs.htm
https://www.gardeningknowhow.com/ornamental/bulbs/tulips/tulips-bloom-every-year.htm
https://www.gardeningknowhow.com/ornamental/bulbs/tulips/different-varieties-of-tulip.htm