Dirt, reading your response about the bulb producing two stems already in the first year I think that your bulb was in the process of dividing internally, although it wasn't visible at planting time.
Perhaps the individual halves of your bulb on their own wasn't large enough to carry blooms or possibly got stressed from growing so tightly together and aborted the flowers.
While they could and possibly now are large enough to produce blooms on their own, you will create a better environment for their future by dividing them this summer if possible. On the other hand if you dig and find that the bulb still isn't fully divided, then perhaps you need to improve the soil structure so it is loose and airy and perhaps also start feeding them more so enough nutrition is available for them already in the early spring.
