When hovering over the graph for 'today' you may see a difference in the 'Actual' and 'base' amounts.
This will be solely down to the budgets that have been set which are included in the 'base' figure.
The best place to see this clearly is from the 'Daily breakdown'. From here you will be able to view all the individual transactions and budgets that are impacting the cash flow. There is also an option at the top to exclude the budget figures and only see the actuals.