If at least 10% of the days are personal days, that changes the rules, and in many cases can allow a deductible loss. I suspect that is what you are encountering.
As a side note, I forgot to ask ask if the average rental period is 7 days or less, which would also change the rules about passive activities. But whether or not that applies to you might not matter because as I said before, I suspect it is the personal days that is doing it for you.
