Coins and purchased skin disappear on iPad

I purchased 320 coins with 1.99 USD on version 1.2.5 (I believe). Then, I used 310 coins to purchase "Cute But Spoopy Skin Pack." After updating to 1.2.7 and now 1.2.8, my left 10 coins disappeared and the purchased skin "Cute But Spoopy Skin Pack" turn back to locked.How can I restore my purchase? Thank you.