Not entirely sure about this, so let's look at the number:

P&H 67 v4.1 (i.e. start of turn 67):

Osoeriene - Prosperity 2-Defiant (+0 Fair tax, +0 less than 1/2 law)

P&H 68 v3.4 (i.e. start of turn 68):

Osoeriene - Prosperity 2-Defiant (-2 Prosp, +2 no tax (temp), +1 festival (temp), +1 bless (temp), less than 1/2 law)

Perhaps herein lies the error? I seem to have ignored the Tax change.

Turn 68 **should** read:

Osoeriene - Prosperity 4-Poor (-2 Prosp, +2 no tax (temp), +1 festival (temp), +1 bless (temp), +0 less than 1/2 law)

So P&H 69 seems to be wrong.

Osoeriene - Prosperity 6-Poor (+0 Prosp, +2 no tax (temp), +1 festival (temp), +1 bless (temp), +2 Agitate, +0 more than 1/2 law)

For next turn you must still work on prosperity; most of the current prosp is temporary. If you up taxes, stop blessing and no more festivals = Rebellion!