If you made a reservation that received the upgrade at the time of booking then that size unit is what you reserved, period. If you requested an automatic upgrade if one becomes available then you received an email informing you of what your new reservation is and that is the unit size you will see when you pull up the reservation on your account. There have been some instances of the system giving automatic upgrades on messed up inventory. In those cases the owners were notified there was an issue beforehand. But I thought we were finally past that with this website.
It is my firmly held opinion that if there is actually an issue then only the reservations that received an automatic upgrade if one became available would be the reservations affected. No one who got the upgrade at the time of booking should ever be affected. The automatic upgrades should be taken in the order of the most recent automatic upgrades first. In other words if both you and I had reservations for the same time and one of us received the automatic upgrade at say 45 days and the other at 30 days, the 30 day one would lose their upgrade before the 45 day one.
Now as to why this wasn't resolved before anyone arrived is flat out incompetence. Both on the part of the website and the resort manager. I would bet, and bet big money, because we've stayed at this resort a number of times and are familiar with the issues there, that the problem is because of the fixed weeks. The resort manager absolutely knows that there are a number of fixed weeks at this resort and those owners should always be in their own unit. That isn't up for debate. Fixed week owners don't own points they own that week at that resort and no one should ever be in their unit during their week without the owners express consent. That means if they don't use it and it sits empty the resort still doesn't have the right to use that unit without reimbursing the owner. There is absolutely no excuse for the resort manager not to be given or have compiled a list of what unit numbers and weeks are fixed weeks and take them out of the inventory. As a VIP owner I can request a specific unit when I make a reservation. If that unit isn't available the system tells me it isn't and I select another unit number. There is no way it is that hard to take unit numbers xxx, yyy, and zzz for week 11 out of the available inventory.