EOFY and Reconciliation

We started accounting with QB online since the beginning of the company so the Bank account starting balance in the balance sheet was zero. However when I try to use the reconciliation tool, it shows an starting balance of negative -2080.25, I reviewed the account history/view register and did not find any opening balance transaction. I tried to create a journal any to define the opening balance, but when I go back the reconciliation tool it just adds to the original negative number, it does not replace it.As a consequence I cannot reconcile the bank account using this reconciliation functionality as does not matter if I match reconcile and match all the transactions, leaving the balance sheet with the right numbers, there is always a difference in the reconciliation tool driven by this -2080.25 that are nowhere to be found in any transaction. Could you please help me out to solve this?    

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for example a cash deposit was made but i mistakenly made it a transaction and it went in as a payment instead

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Despite x2 year data conversion account showing transactions back to 2015

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I had previously reconciled about 90% of 18 months worth of transactions using QB 7.4 which then ceased to function so changed QB online and had the files transferred but can't find any sign of any previous reconciliation. I don't want to do it all again.