I'm using iPhone 5 running iOS 6.1.4 with Bakery Story 1.6.8

I purchased a cafe chair with one gem an hour ago and it only showed up for a second, until pop ups appeared and covered the screen, the chair disappeared. I waited for a while and did the purchase again, same thing happened. I have lost 2 gems today by purchasing nothing and it's not the first time I've encountered this problem. Please fix and return me my gems :/