I'm stuck on this "transfer the light from each lantern to the Sakura Lantern". Nothing I do seems..

I know this is a bit too late for you, but I had the same issue. Searched and found your question.

This is what I ended up doing. I closed down the game. Took about 30-40 mins to web search (find your question), search the G! site (no answers), search the facebook page (this time the question in Spanish {I think})... decided to take a video of it to upload to G!. And lo and behold it now worked. So, no real fix but closing and waiting seemed to have worked out the bug.