I am sorry for this delayed reply to your gardening question. The spring rush has brought a deluge of questions and we are working hard to catch up!
Bulbs are like that. Sometimes they will naturalize and bloom and with others they are more "one shot wonders" that just don't like something in your soil or climate and as such don't repeat well. I suggest moving them to another location in the yard. Perhaps a little more sun but not full sun. Perhaps morning sun versus afternoon. Anyway, I have seen a change of location make the difference.
Thanks for the question. Best wishes for a wonderful gardening season. Please stop in again soon!
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