I've only had this phenomenon occur to a couple of Hadeco bulbs from South Africa. I attribute it to the stressful trip and subsequent change/flip of seasons, because they came from the opposite side of the equator.

There are so many variables that go into the culture of a Hippeastrum bulb, that without knowing the particulars of how you're growing... the environment, and what you do... that anything I said would just be a guess.

I would say stress to the bulb is involved, but what caused that stress is a mystery until more information is given.

Can you relate the particulars? I'd happily take an educated guess if I knew a bit more.

They sat in a sunny window all last winter and then grew outside all Summer long. THey were put outdoors in their original pots (holes in the pots), planted in a bed with dappled sunlight / shade. They were fed with Miracle grow once a month. I brought them in around Sept 1. Took them out of their pots, cleaned them off and put them in a brown paper bag and refrigerated them until second week of November. (no apples in the fridge). Around second week of Nov. I repotted them in their original pots with some leaf compost . This compost is rich, but drys out very easily (much more than that pellet shaped material that comes with the bulb kits). When I potted them up I noticed those flower buds sticking out of the bulbs. They were given an initial watering of warm water (watered from above , trying not to splash water on the bulb itself). I placed the bulbs by a south facing window. They were Kept warm (around 70 degrees F during the day and 60 degrees F at night). The one bulb (Apple Blossom purchased the year before) bloomed just fine. The other nonflowering bulbs were ones I had kept from previous years. They were all very big, nice size bulbs but ...As I said , in these third and fourth year red bulbs, all the flower buds made an appearance but then shriveled up and disappeared.

Hi -
Cultural practices seem okay to me, especially since you're having luck with "Apple Blossom". There's a few things I would do differently, but that's just preference. An extra step you could try with the stubborn ones is to try some bottom heat.
Gail

You might want to check the basal plates of the old "not performing right" bulbs. You might have a case of an old bulb that needs "rejuvinating". Search the forum about it if ever.

☹

Uh oh.....:-(

Yuck. Doesn't look good!

mummy comes back to life.....

The bottom one looks like it hasn’t gotten any sun—I have never had a bud or leaves not turn green. You are much more careful with your bulbs than I am but I too put them outside (on the deck) for the summer and bring them in in the fall. I never dig up the bulbs and refrigerate them—they’ve been in their pots for years, only re-potting when they outgrow them with so many new bulbs shooting off the original. I started with three bulbs and now have over twenty, all produced from the first three. Once I had a bud which was on a stalk that never grew more than a few inches, but the flower still bloomed. I don’t know whether this helps but I do try to peel back some of the outer layers at the top of the bulbs in the fall so scapes don’t get “trapped” in a tight neck, and I even slit the sides of the neck with a sharp knife. I sprinkle the bulbs with cinnamon, which I read prevents fungus.

Right now I have nine buds and one almost ready to open. The blooms shown are from 2018 winter.

Cynthia, that photo is glorious, I'm especially loving the white with green center !