in 6.04.01, when a Barbarian rages, and i apply the Temporary Bonus "Rage", the AC correctly changes by -2.
in 6.05.01 when I apply the Rage bonus, Ac drops -4.
pathfinder core supplements rule-set
Using the latest version, I correctly show the Rage Penalty as -2.
However, the AC is showing a -4 when Raging is enabled. Perplexing.
REMOVE the Rage temporary bonus, and then re-apply it. Let me know if that fixes the issue for you.
informally I can say "yes and no". I have seen that removing the Raging temporary bonus and re-adding it resets the problem... but many other minor changes re-instate it.
Yes, after every change I can "fix" it again, ...
if you made a change to fix it, then I think it works if I remove & re-apply
A quick live test shows it with -2.