I tried SEA-LAX/BUR/ONT/SAN/SFO/DEN/PDX/ANC and gave up. Only seeing this on SEA-OAK, but there's got to be something else.
SEA-OAK also has 7.5K mile prices. No 21-day adv purchase like DL or previous AS award sales.
I wonder what inventory bucket the 5K price is tied to vs the 7.5K price? Assuming they both also book out of W.