In order to reproduce the problem, you need a druid with talents spent to obtain Starfall.

Starfall doesn't benefit from spellpower correctly, noticed it when i reached over 3500 spellpower and it still did low damage as if i had < 900.

Here is the correction:

DELETE FROM spell_bonus_data WHERE entry IN (50288, 50294); INSERT INTO spell_bonus_data (entry, direct_bonus, comments) VALUES (50288, 0.3, "Starfall (DIRECT) - 30% spellpower benefit"),

(50294, 0.13, "Starfall (AOE) - 13% spellpower benefit");

Note that from the core side, still problems remain!