I have added 5 consumable IAP to my iOS game. Out of these 5 consumable IAP, when I try to purchase one specific IAP, I see the popup saying "This In-App Purchase has been already bought. It will be restored for free."
The other 4 consumable IAP are working properly. In iTunes Connect, all the 5 IAP are set to “consumable” so there is no configuration problem.
This issue happens on iPhone 6s (iOS 11.4.1) and not on iPad Air (iOS 11.4.1).
How to fix this issue?