When I reported the problem, the support rep claimed it happened that way because I had "Smart Pricing" on. It was set ON by default. But AirBNB's own documentation says the Custom Price I set for the dates in question (Xmas week) override all other pricing.
Even if "Smart Pricing" had applied, it shouldn't have offered the lowest price for the highest demand week of the year, because AirBNB's own calendar shows the demand peaking high for the week, not low.
Now I've been 3 days trying to get a response from tech support.
They deny responsibility, and promise to escalate it to a supervisor, then close the case without responding to my detailed evidence.
What can I do? Does anyone know how to escalate to an AirBNB IT person? I would have thought AirBNB would like to know its platform has a serious bug.