Sometimes, depending on the environment, bulbs can develop mold. This is usually due to the moist bottom of the bulb being exposed to air early on.
If there is mold, we recommend carefully rinsing the bulbs with tap water. Take care not to damage the roots. Change the water that is in the vase and repeat the next day. It is very important not to over-water the bulbs. Roots should be kept in water and try to avoid dipping (splashing) the bulbs in water when moving the vase. Keep the vase in a dry and well ventilated environment, like most living rooms.
If you think there is another problem, like damaged bulbs, we'd like to see a picture of it so our grower can take a look and see what else could have happened.