Certified GKH Gardening Expert
This is common with overwatering. The soil should be allowed to dry out very thoroughly between waterings, as these are extremely drought tolerant.
They can do this in response to a lack of light, also, but this is less common.
This article will help you to care for these: https://www.gardeningknowhow.com/houseplants/snake-plant/droopy-snake-plant-leaves.htm