Blizzard adjusted the Base Mana cost of a few spells and recently gave Hammer of the Righteous 2 charges on the Dragonflight Beta.
Crusader Strike now costs 10% of Base Mana (was 11%).
Light of the Martyr now costs 9% of Base Mana (was 7%).
Holy Light now costs 16% of Base Mana (was 15%).
Hammer of the Righteous now has 2 charges by default.