Certified GKH Gardening Expert
Unfortunately, without knowledge of storage conditions it would be hard to say what happened. Most of the cause of Amaryllis failure will be trimming living growth too early in the season before dormancy. Leaves will not need to be trimmed until they are dead or almost completely dead.
What I can do, in the meantime, is include a link for an article that will help you with proper winter storage of these bulbs. This will ensure uniform results year after year. Also, I will include an article for the care of Amaryllis: