This month is empty even though I entered work

Steps

Open Company & settings and check Reporting year.
For cash received, confirm you recorded an invoice Payment or Other income with a date in that month. Creating an invoice alone is not money received.
For cash spent, confirm the expense is marked paid and check Date paid. An unpaid bill still counts as a cost but not cash spent.
For labor, Draft hours have not yet created job costs. An authorized office user must review and approve them.
Check the wording under each total: some show all dates while charts use the reporting year.

The total agrees with the transactions and dates included by that screen.

Do not enter a balancing monthly amount to make the graph look right. Correct the source record or payment date.