I think that Brand of the Sun got bugged due to this change:
The following powers have had backend changes to be slightly more server efficient. The changes should have no player-facing effects. • Devoted Cleric (Divine Oracle): Brand of the Sun
Before yesterday's patch: If a target affected by Brand of the Sun died, you still gained divinity over time. After yesterday's patch: When the target affected by Brand of the Sun dies, you stop gaining divinity over time.