Hi - on my upgrade emails the past few days for this PHX-LGB flight it says "Complimentary upgrades not offered" despite the seat map showing an F section with 5 seats open. This is different than the normal message when US is just not releasing open seats.

Any thoughts? Not a huge deal on a 1 hour flight but would be nice when that's the only upgrade it appears I could get on this 4 segment trip.