Good morning, I would be grateful for your help. 

I conducted a bank reconciliation on the client's account up to ncluding May and everything was fine, all the data matched, there was no difference. But an error occurred: when reconciling the Trial Balance, the balance on the Bank account does not match. 

The Trial Balance in the bank section shows the balance at the end of February, the amount in Cr. When I open the reconciled bank and there were no discrepancies during the reconciliation. The difference is in the Trial Balance - 14 000 pounds. When I try to reconcile the Bank for February, it shows me many different transactions for different months. I tried to put a tick on each transaction. And in the "difference" section, I got that amount that is indicated in the Dr of the Trial Balance. But I can't save because the amount is minus. 

If I remove these ticks - the statements is correct, except for the Trial Balance. 

How can I fix this error? 

Thank you