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Um, it's not rare, it's actually very, very common for platies and swordtails to mate together. In fact most of the swordtails in the aquarium trade nowadays are platy/swordtail hybrids.
Your stories not unusual either, Dieses; I was reading something recently about some research where they'd discovered that platy females actually prefer males with swords on their tails, even though males of their own species don't have them!