Can you post a photo? The term "Elephant Ear" is used for so many different plants in a variety of genera it is not easy to give the correct advice without knowing which plant is involved.

Since you said it is growing from a "bulb" which in an aroid would correctly be a tuber I assume it is likely a Colocasia but there could be at least two other genera involved: Xanthosoma and Alocasia.

Can you tell us about the soil you used and how often you water? If the soil is dry that could easily be the problem. These types of plants prefer fast draining soil that will stay damp but not soggy and you often need to add some extra materials to the soil.

Steve