yeah having the two events play at the same time would do it
One more thing, I think I've beat the game now (or whats out so far) and I cant view the momma rena scene after giving her the gift. The photo doesnt show up when giving her the gift and when I try to view it in the gallery it still tells me to explore and find the gift.
Tried to load a new save file and use the skip crystal to get back to the kuro area and had the same issue.