Hello Command! First of all, welcome to the forum
! If you mean earning money just by playing the game and later losing it, I think it's completely normal.
First of all, I'll try to explain how it works. When you are in an online game, you will automatically get cash, exacly $1 each two seconds ($30/minute). However, this feature was added in an update a while ago. This means that the game wasn't originally prepared for it, so it may be a bit glitchy.
The reason why this happens is completely unknown for me. But don't get nervous, you aren't losing your money. The only thing is that the gane just adds fake money to your saving that in some cases later disappears. The cash that game shows at the menu is yours and you will only lose it purchasing planes or upgrades.
However, you can also earn it bringing down reds or completing missions (yes, you don't have to win to get points and money
).