It sounds like an issue that we've seen reported with a specific version of the game, which is a bug. In order to tell you how to proceed, we'll need to know a few more details, though.

Could you please tell us more about your game? Are you playing on Android or iOS? What is the exact version number that is displayed in the lower left corner of the first screen after the game loads (the screen with the Play button)? Does your game have both gems and coins, or does it have only coins?