Targets allows you to put in a general target which is higher than your balance. In my spending tab it shows a green sum (My target of £400), but I only have a card balance of £250. I have one tab which is green with the message that I can spend money, and this does not tie up with the balance screen.
I don’t think its a bug, but maybe the logic needs to be rethought. Maybe a “!” or a comment next to the total target?