loss of blooms in some daffodils

Dear Daffnetters,
Some more questions from a novice:
Two years ago, I planted hundreds of N. obvallaris, Standard Value and Arctic Gold in our backyard. During the first spring, all bulbs had great blossoms. This spring, I’ve “noticed” that only about 25 to 30% of the N. obvallaris are developing blooms, lots of the leaftips are yellow or brown. Arctic Gold has one to two blossoms per bulb, so more than 100% blooms. What’s up?? What can I do?
Thanks, Niels