Is this what's happening:
Buy an alchemist's lab - the total is ~-350 gp
Buy a mug of ale (2sp) - the total is reported as ~-350 gp, and if you mouse over it, it tells you you have -350 gp, -2 sp.
Add 500gp on the journal - the total is ~150, but it's reported in red, because if you mouse over it, it tells you that you have 150 gp, -2 sp
The progam only makes change during the purchase process, not while adding more money, so you can fix it by making another purchase that you can afford.
We've decided that allowing you to spend more money than you have is not how we want to handle it, anyway, so this problem will go away then.
Buy an alchemist's lab - the total is ~-350 gp
Buy a mug of ale (2sp) - the total is reported as ~-350 gp, and if you mouse over it, it tells you you have -350 gp, -2 sp.
Add 500gp on the journal - the total is ~150, but it's reported in red, because if you mouse over it, it tells you that you have 150 gp, -2 sp
The progam only makes change during the purchase process, not while adding more money, so you can fix it by making another purchase that you can afford.
We've decided that allowing you to spend more money than you have is not how we want to handle it, anyway, so this problem will go away then.