David called the store to ask us what was happening to his succulent. I asked him to send us a photo and here it is.
The plant is Graptopetalum paraguayense, and the “deformed” part is what we call “Crested”. It is a genetic mutation, usually caused by a virus, and it makes the growing tip of the plant grow out linearly rather than the normal branching and rosette. There’s nothing to worry about – crested plants are often prized and collected.