Items not dissappeared when tow players open same chest

Iam on Android 4.1.2 sumsung glaxy s3 mini version 0.15.1 b1 when I play with my frind he have ios5 version 0.15.0 when we open the same chest in the same time I take items but items didn't disappear for my frind (ios)
That can make a glitch to generat items many time