Calculated statement balance incorrect

I  am having an issue with reconciling accounts.

The "paper" statement balance for February 2023 and calculated statement balance are different. The account had last been reconcilled in Sept 2022, looking back at this the balance then now also different.

I have also  looked in "Find Transactions - Accounts" - and this also shows the correct reconciled figure that was done back in September.

I looked in the forum & found a solution that was posted, followed the steps. Entered the bank balance the same as the closing balance dated it in the future (e.g. 1/12/2023), then  reconciled. After it's reconciled, I undid the reconciliation. This didn't work, so I followed the next suggestion, 

and undid the reconciliations and kept going back but they keep showing the same out of balance amount and I have undone the reconcilliations back to March 2021. 

Can you please give me any other advice on how to fix this. 

Thanks in advance.