Good day

Can someone please assist.
I've just updated my November cashbook.
I've noticed that my cashbook details via the bank reconciliation function together with my FNB bank statement balances 100%
When I however opened my cashbook to process entries,the balance is less with a R4000 difference as per my bank statement and cashbook details.
I went to check from March up until November and it all balances 100%.
When I process bank reconciliation it says all entries has been reconciled.
I've printed all cashbook details,and the opening and closing balance is exactly the same as my captured entries and bankstatement.
Why when I opened my cashbook it is now sitting at a completely different figure?

Will appreciate someone's soonest response

Kind Regards