[_Tommy]

Split your line. The first would be reading the needed deposit value,

pawn Code:

new cash = PlayerInfo[playerid][BankMoney] += money)

And the second one would be the dini save,

pawn Code:

dini_IntSet(file, "Bank Money",cash);

I'm not sure, but it might be something that you haven't shown us. For example, maybe a bad code while getting the money variable?

BTW, I suggest using Y_ini instead of the old dini, this is much faster.