Start with the largest items. Most surprising totals come from an amount, frequency or item type that is not what you intended.
Check these first
- Is income entered as Income and a cost as Expense, Debt or Investment?
- Is a weekly amount marked Weekly rather than Monthly?
- Did you enter an annual total as a monthly amount?
- Is the scenario using a proposed amount instead of the base amount?
- Is a regular cost marked Once?
- Is an item missing or included twice?
Switch between week, month and year to help spot the pattern. If it still looks wrong, note the scenario, item and expected total when reporting the problem.