Here's an odd one I just experienced. I booked 5 nights at the Sheraton Cebu for 152K pts. It dropped to 149K pts so I modified the reservation. Then out of the blue it jumped to 217K pts. (The first 3 nights had gone from ~35K pts to 60K pts.) I figured that meant any further decreases were out of the question and the place had been booked for a wedding over the weekend, but no, 2 weeks later it dropped to 147K pts, so I collected those 2000 pts.