Singapore Airlines KrisFlyer - Wildly different availability between EF/KVS

I'm looking at some SQ flights on both ExpertFlyer/KVS.. seeing very different availability on both.

Eg. SIN-SFO

EF shows:
F4 P0 A4 Z4 C4 J4 D4 Y9 B0 W0 Q0 N0 V0 S0 E0 M0 H0 T0 L0 K0

KVS shows:
F3 A1 C1 J0 D0 Y0 B0 M0 W0 Q0 N0 V0 P2 H0 K0 Z1 S0 L0 T0 G4

which is correct?

Likely POS or booking source issue.

EF uses POS USA. KVS has more than one POS. There is no correct availability. It depends on your POS and booking source.