Difference in supplier balance

Hi, GurusPlease help us for the following issue

1 - We want to calculate balance for supplier  number 3328 and form the calculate balance owed window the supplier balance is Zero.

2 - The supplier has only 5 invoices and these invoices are paid.

3 - The Accounts Payable Negative Supplier Balance shows -25842.40 .

So please why the Accounts Payable Negative Supplier Balance shows a balance for this supplier?

The Accounts Payable Negative Supplier Balance is attached.

Your prompt reply will be high appreciated.

Thanks

George