If the reports are giving an incorrect balance for your opening bank, the Bank account details may not have been configured correctly in the Cashflow Settings.
Navigation to:
Budgets & Cashflow > Cashflow Settings > Bank & Equity
Check that the account(s) nominated as your main Bank account is correct.
If you allocate more than one account, the Bank Balance will be the sum of all the nominated accounts, and none these accounts will be available to budget movements on.
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