Is this still happening?
If it is clear your cache or app data.
If it doesn’t fix it please send me your User ID.
Looks like this is client sided. The server sees him as levelled up (XP bar is above limit) and hence had a load of coins given to him allowing him to spend while seemingly in negative money.
Ur right the XP bar is always above limit when you level up from campaign, then after U play another one it updates
It happens every time, if I buy boxes after leveling up
I just reload my app and everything is going good.