Hi Rae,
Do you report on a cash or accrual basis for GST?
Is there a chance that they have only recently been marked as paid and that's why they appear if you are on a cash basis?
Feel free to email me directly if you would like me to remotely login and look at this for you, and we can arrange an appointment.
Kind regards,
Sally McIntosh (sally@samsolutions.com.au)