Had this happen to me as well. Shown an upgrade to an executive suite the morning of check in. Checked in through the app and when I looked later that afternoon it was downgraded to a regular room. I'm going to guess the weather caused the hotel to become nearly full with distressed airline pax because when I arrived at 11pm there was a line out the door to get checked in and I could no longer use OLCI after the downgrade. Took nearly an hour to get through the line. I even went down and asked in the morning what happened because at that point I just wanted to get in to the room. I was told that I was in a suite (I was not). I have no idea how she was under the impression that the downgrade from a suite to a room with a view or something was considered a further upgrade. I ended up getting 10k points for the trouble after the fact at least.