in 6.04.01 PCGen correctly applies the Barbarian rage bonus to temp Str and to temp Con, as temporary only, and does not change the rounds/day: Barbarian 8, base Con 16 = 4 +3 (Con) + (8-1)*2 = 21.
In PCGen 6.05.01 and onwards, the Temporary Bonus "Rage" wrongly increases the base Str and base Con, shows Temp Str increased but no increase to temp Con. (On Character Sheet Preview and exported PDF)
It now shows 24 rnds/day Rage, which is the value for Con 22 which is only the temp Con.
pathfinder core ruleset