KirriCorp

Just the bold matters.

Rin puts Fair Wind from their hand into the conflict.
Rin's creatures have received the effect of Fair Wind and have +3000 power this turn.
Rin has attacked their opponent directly with their Wispy Shala.
Rin's Wispy Shala does 1 damage to [ZK] Sarius's Grid (+1 tempo).
Rin's Fair Wind was destroyed.
Rin has attacked their opponent directly with their Madame Sharley.
Rin's Madame Sharley does 1 damage to [ZK] Sarius's Grid (+1 tempo).
Rin ends their turn.
[ZK] Sarius draws a card.
[ZK] Sarius puts Photosynthia, Floral Empress from their hand into the conflict.
[ZK] Sarius puts Photosynthia, Floral Empress from their hand into the conflict.
[ZK] Sarius puts Quickfire Sedative from their hand into the conflict.
[ZK] Sarius needs to make a choice before the duel can continue.
[ZK] Sarius has chosen Rin's Kafan Tara.
[ZK] Sarius's Quickfire Sedative was destroyed.
[ZK] Sarius is attacking your Kafan Tara (slot 5) with their Steady Roots. Block?
(To block, click on the Blocker with your left mouse button. To allow attack, click on the attacked card.)
[ZK] Sarius has attacked Kafan Tara (slot 5) with their Steady Roots.
Rin has blocked the attack with their Meryl Maid.
Rin's Meryl Maid was destroyed.
[ZK] Sarius is attacking your Kafan Tara (slot 5) with their Engorica. Block?
(To block, click on the Blocker with your left mouse button. To allow attack, click on the attacked card.)
[ZK] Sarius has attacked Kafan Tara (slot 5) with their Engorica.
Rin has blocked the attack with their Polyphonic Flo.
Rin's Polyphonic Flo was destroyed.
[ZK] Sarius's Engorica was destroyed.
[ZK] Sarius has attacked Kafan Tara (slot 5) with their Engorica.
Rin's Kafan Tara was destroyed.
[ZK] Sarius's Engorica was destroyed.
[ZK] Sarius ends their turn.
Rin draws a Parkour L.
Rin puts Parkour L from their hand into the conflict.
Rin's Wispy Shala was returned to their hand.
Rin's Wispy Shala was returned to their hand.

You activated Fair Wind in one turn and summoned Parkour in another. Remember Fair Wind only lasts one turn, you can also see that in the powerup message in the log. Even if it were the same turn it might do the same (though i'm not sure) because the program itself does not track powers, but only launches messages regarding powerups (might be wrong on this one).

One of two things is happening and I need more data to be sure. Either Fair Wind power is not being reduced (unlikely), or you had Morning Glory or something in play, but no other shark (is this possible in the deck?)

If you had Morning Glory out, Parkour is weaker than Shala if no other sharks.

There's also a possibility of the power shift playing out (effect wise) such that that would happen even if there was another Shark.

Also Syrius you are indeed incorrect, KP tracks all creature powers at all times, the only thing that is notable is that obviously it can't literally activate every single simultaneous (by rules) power check at once.

I hade no Morning Glory.

I just noticed something in a duel. Fair Wind gave the +2000 message in MY consecutive turn, skipped the opponent's.

Noted, that's very likely to be the problem then. Will be looked into.

I believe I have now fixed the fault in Fair Wind.