Sometimes people are so quick to send us a question they forget to tell us who they are, or where they are. In general, it’s always nice to see a question signed by a person so we know it’s not a bot.
Not sure why it looks like this. In raised pots, we do get frost on occasion, maybe too much/little water?
In general succulents do lose bottom leaves, so as long as there are new leaves growing in the center its not really a problem. However it does like like it might have been some freeze damage, so maybe next year if you’re going to get a freeze you could cover it with a frost blanket.