When i brought my Kalanchoe in for the winter they were young and had already started producing babies but they stopped when i brought them in & held back on the water as i do with all my succulents in the winter.It's now getting close to spring and when i started watering again and it's getting more sun it's back to making babies.
In other words i have no idea what could be your plants problem.Is it old enough to have gone through "the change"
maybe in their old age they stop making babies
sorry not much help
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