What's wrong with my succulent?

4 months ago

I bought them from a pop up store in a mall. They were doing fine for a couple weeks, but the tops of one broke off in an accident. I researched a bit and thought it would grow back fine, but it eventually started to rot. I had to remove the plant, it's missing in the picture. the top that broke off is still healthy, I'm planning on replanting it in another pot. The other two began developing sort of brown/black patches, I don't know if it's due to over watering or if there's a fungal infection. Can someone help me?

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