The left column of budget flow is intended to be the budget it self. The problem is the total value at the end. Instead of subtracting the expenses from incoming, it is adding both values. For instance: If I have an amount of 2000 of expenses and an amount of 2500 of incomes the total amount will be 4500 instead of 500,00. This might be happening because of a changing of some way that Gnucash handled the incomes and expenses.
I hope you improve the budget as a whole asp. Because this is a great software that has a great potential to be one of the best financial software.