The Lithops in the top pic could be absobing the outer leaves for new growth, like the ones in the bottm pic. When absorbing old leaves for new growth Lithops can become wrinkly. They will absorb every last drop of moisture out of the old leaves until all you have left of the old is paper sheaths.

On the wrinkled one are you able see anything when you look through the spilt? Here’s a guide to growing Lithops I’ve found that’s fairly short and gets to the point.

Hi, NO MORE WATER! Lithops are native to Africa and they will shed their outer leaf in the spring. Until this leaf is shed, your not supposed to water them. They will appear extremely wrinkly as the outer skin dries up and it will show the new one inside. Until the skin has dried and fallen off, don't water. Lithops need a south facing window especially in winter. Give it direct sun. It can be confusing cause succulents wrinkled mean they need water and Lithops will also do this but it only means water during their growing season. When they wrinkle at the end of winters and spring, never water. I have about 60 Lithops and probably water them three times a year and only in summer when they appear soft. Lithops have the ability to store water like a cactus. They are amazing little plants and require little watering and direct sun. The one you watered, I would take it out of the pot and put it in direct sun to dry it out as fast as possible if its it's still wet. They also take a long time to show rot. You may loose the one you watered, but just hold the watering on all. Good luck, as they are truly one of a kind!

Mishelle

you have to give them a little water or the roots will die, and then when you water, that's how they rot. they need to dry fast fix your soil up so the water drains straight out the bottom :)