Ast Diurnal and Nocturnal Sect
Just now I was healing in Keeper of the Lake. I switched to Nocturnal Sect to put a barrier on the tank before pulling the boss, and immediately switched back to Diurnal just before he pulled.
However, during the fight every time I casted Aspected Benefic or Aspected Helios my party members received the barrier buff instead of the regen. I doubled checked that I was in fact in Diurnal Sect multiple times, but every cast granted a barrier.
It seemed like it was just a buff icon bug. I was probably still in Nocturnal Sect even though it displayed Diurnal at the top.