I thought I was reading my own story. The same thing happened to me yesterday at the London Hilton at Park Lane:

https://www.flyertalk.com/forum/30040697-post646.html

Basically I booked a rewards room. For a few months, the rate showed up on the app as a King guest room. When I checked in, the front hotel "upgraded" me to a Queen guest room. Apparently better because it's on a higher floor. Better options available on the app. After a few conversations, they gave me a King room on a high floor (I didn't check the rate on the app because I don't want to ruin my vacation). The room is bigger but it smells like it used to be a smoking room.

The view is nice but not going to stay here anymore.