Standing in front of the Shrine to Spriggan in Hayden Seek Alley. I sprinkled Extremely Hallowed Shine Powder, then donated 7 Pleasing Amber, and the "reward" bubble showed up like it should. I then donated a Showy Sapphire, and the mood, XP, and favor icons from the previous donation showed up right below the bubble for the Sapphire donation. Then I tried to replicate with some Sparkly, and the same thing happened, so there were three sets of donation rewards showing up at once.
Just did one chunk of Sparkly and the rewards just showed up over the top of everything else.