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Your bulbs just started to wake up from dormancy and the stem is white from lack of sunlight.
Plant your bulbs as you would normally .
If the bulbs are soft and mushy, they should be tossed out.

Are these old leaves, or new leaves? The new leaves will start curled and unfold as it grows. If these are old leaves, then I would suspect overwatering. Make sure that you have plenty of drainage, or have a way to remove all excess water from the container. Make sure to only water once the top two inches of soil are completely dry.

If the soil that you are using is MiracleGro with slow release nitrogen, then this is your problem. I see more problems caused by this soil than anything else.

These two articles will give you an idea of the care of these indoors. There are two main types, so I will include articles for both, since I'm not sure which one that you have:

https://www.gardeningknowhow.com/ornamental/bulbs/elephant-ear/growing-elephant-ears-indoors.htm

https://www.gardeningknowhow.com/houseplants/alocasia-plant/growing-african-mask-plant.htm

This is not enough of a description to give a diagnosis.
These links may help pinpoint the issue.

https://www.gardeningknowhow.com/ornamental/bulbs/elephant-ear/elephant-ear-plant-diseases.htm
https://www.gardeningknowhow.com/ornamental/bulbs/elephant-ear/elephant-ear-brown-edges.htm
https://www.gardeningknowhow.com/ornamental/bulbs/elephant-ear/elephant-ears-taking-over.htm

If you do not want the seeds from the pod, then you can cut these as soon as the flowers fade. If you do want seeds, then you will have to catch them as they dry and start to split. They will not be viable for very long after they are out. Once they dry out, they will be dead.

It is part of the natural cycle of the plant, and there will be no good way of controlling it without starving it of nutrients in a very controlled manner. It is very advanced, and not advised, as it could risk the health of the plant.

The most common pests you see on elephant ears are spider mites which love the texture of the elephant ear leaf, especially if you have it in a room where the air is very dry. To get rid of the mites, try rinsing the plant thoroughly with a good blast of water, or following the label directions, treat with a specific miticide.