Available fare buckets versus actual available fares

I've tried researching this a little, but couldn't find anything - please direct me if appropriate

I'm looking to fly SFO-KOA r/t in August. The flights I want currently show:

Outbound (Aug 9): F9 A9 Z8 P6 Y9 B9 M9 E9 U9 H9 Q9 V9 W9 S9 T9 L9 K9 G0 N0
Return (Aug 21): F9 A9 Z9 P9 Y9 B9 M9 E9 U9 H9 Q9 V9 W9 S9 T9 L9 K1 G0 N0

When I select those flights, the cheapest option shows up as booking in W on the outbound and T on the inbound.

My question (and apologies if it's dumb), both flights show K, L, T and S "availability" and I'm well outside the typical 14 day purchase requirement, so why does it price in W and T?

If the answer is the fares aren't published/active for the lower buckets, why are they showing as having availability?

Thanks

GS