dirtdorphins,
I don't think it is a garden thing, being someone responded that they had the same problem with some grown indoors. I have some bulbs that I planted in this same bed last year, I will watch them and see how they behave this year. I will look close and feel about the bulb to see if I can see any depth or obstruction problems. The tall and the short are not the same variety, even though I don't know what they are. The tall one is about ready to bloom.
Looking at the short stalked amaryllis they do look like they are planted pretty deep, none of mine are planted shallow like you often see them with half the bulb showing. Mine are all planted with the complete bulb under ground because I am in Zone 8b. The bulbs just naturally seem to select the depth they want to be at.