Originally Posted by
DaojinWildfire
This is only a cosmetic bug and you're not actually losing any coins. At this time, the game is giving you twice the Welcome Back bonus coins, when you should only be getting it once. The game realizes that it gave you twice as much and corrects itself by removing the second bonus coins.
On your end, it looks like you're only getting the bonus once. On our end, it shows that you're actually receiving the bonus two times. So the coins removed from your game is actually the bonus system correcting itself. We are currently looking into this cosmetic issue.