A few more data points
Seeing all kinds of points pricing inconsistencies yesterday and today for the Doubletree Barcelona in September (three night stay). Yesterday it said only premium awards were available at some odd rate of 74,4xx a night. This morning that rate was 76,2xx, then an hour later a flat 72,000 (with no disclaimer about premium awards only being available). Hotel is bookable for cash those nights at 242€ (refundable).
Yesterday I held my back-up choice the Hilton Barcelona at 40,000 per night, and that rate is still in force today. The Hilton Diagonal is sold out BTW.