The three causes, in order of frequency
They are worth telling apart, because they are not corrected in the same way. Two are about tooling, the third about habit.
- The iCal delay: the night goes on Airbnb, Booking.com only learns of it hours later, and sells it meanwhile.
- The late entry: a guest books by phone, and the block is only placed that evening.
- The forgotten platform: a unit stays on sale on a site nobody has opened for six months.
- The rare but expensive case: the number of identical units lowered without bringing the already-open dates down with it.