The key is knowing that the Hotel is doing this, not reservations...........
Even when they change and add the extra bed fee, I just ignore it and will address at the property since I have the original booking.(never had to do this) If the Hotel adds a fee, then I just address it at checkin. Only had this happen once 65 Euro extra bed fee(showing in the Res after alteration by hotel), but wasnt an issue, they were just holding it..