Diamonds removed

Every time I play piñata party for the last week, it removes 10+ diamonds when I win. I couldn’t figure out where/when my diamonds were dissapearing until today, after I screen shotted between each level. 

I just won piñata party, exited the level to see 10 fewer diamonds, and then because I had hit 8 daily challenges, I was “rewarded” 10 diamonds back.