Maximum Cash...???

1. My cash before selling players is 2.08B


2. Then sell the players at a price of 120M


3. My cash is supposed to be : 2.08B + 120M = 2.2B.. True,..??

4. But it turns out my cash still survive in 2.15B



Why it happened,.??
Is there a limit to the maximum amount of our cash,.?
And whether the limit can be removed or eliminated,.?


Thank you