That is not normal. There is some loss of older leaves from time to time but I suspect your plants were either reacting to a dramatic change in light intensity or perhaps to a watering extreme such as soggy wet or very dry for a period of time. Provide them a very dilute solution of a soluble plant food such as Miracle Gro (the low "constant feed" label rate) and put them in a very bright area but out of direct sunlight. They should be fine in time.
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