Supplier liability account

Hi

I have encountered a strange issue where under this supplier 's  liability account was created correctly for most of the invoices except for one invoice.

Understand that when create the accounting entries, the supplier liability will be defaulted bsed on the supplier site >Accounting>Liability tab.

I have viewed this supplier liability account, it now defaulted to the correct account.

Hence how can I troubeshoot why this invoice has created with the wrong supplier laibility account. 

In fact the user  have created 2 invoices under the same supplier within half hour difference, one with the liability account created correclty while other one is wrong.