I'm set to check into the Zurich Marriott tomorrow and had booked a Deluxe King Room on marriott.com using a corporate code. I was checking the app this morning to see if I was upgraded (as a Bonvoy Platinum) and saw that the room type had switched from what I booked (it had shown as a Deluxe King Room from when I booked up until this morning) to a Single Queen Room. The amount I'm set to be charged hasn't changed and looking at room availability for the duration of my stay shows my original booking type still available (as well as upgraded types).

I did a quick search but wasn't able to find much, is this normal? Other than calling and requesting my original booking to be honored (or upgraded) do I have much other recourse?