Had this happen last week with 3 reservations - 2 @ Stamford Marriott and 1 @ New York Renaissance 57. I had to cancel one of the Stamford reservations and ended up calling the Platinum line to do so. I could NOT see the reservations in my upcoming stays online or in the app. I am seeing some future reservations showing up twice in the app (but not online)

Inconvenient for sure....