Sticker Problem (Merge)

I am having the same problem, I was level 8 in peashooter, about 3 more challenges to get my next level, I also earned about 4900 coins that game, when it ended, I have peashooter level 7 with only 3 challenges completed and I lost all my coins I just previously earned and like the other guy said, they sometimes come back when I enter the sticker shop but my character levels don't.
Another problem I'm having is that I am not receiving the sticker packs from the past events that I recently contributed in (I didn't receive the 100 skip challenge stars)