Hi!
Don't know if that ever happens to anyone:
I was playing on my son's farm account. While planting some strawberries, he got some cakes and pies and I was able to redeem twice so he got twice 500 xp + 200 xp because he mastered the first level of Cakes & Pies!
Coming on his farm, as I planted new strawberries, I got the "out of synch" message, and lost the xp from the collectibles!! I tried to shut the app, and then to shut down the Iphone, but was never able to get the collectibles back
Has it ever happened to you?
Thanks