1. You are giving them too much water.
Succulents don’t need to be watered like your ordinary or typical houseplant. They are a type of cacti after all, so they can get by with less water and enjoy well-drained soil. The soil should feel cool and damp to the touch, but never saturated or watered down and NEVER muddy. You might want to mist the ground instead of feeding directly for best results.
2. The planting container is too small.
Did you find a cute tea cup or flower pot for your succulent? Sure it looks nice, but does it give the roots the room it needs to grow? Probably not. The depth of the container should be twice as deep as the roots of the plant, while the width should be at least three times as wide. Doing this gives the plant plenty of room to spread out!