Purchase invoices

I have uploaded 70 purchase invoices for a monthly statement into the drafts, I have went through each one and approved them all.

I can see all of these now in my purchase invoices under that supplier. When i go into banking and reconcile the invoices against the payment there is one invoice missing.

Has this happened to anyone before or would anyone know why this is happening?

I have tried deleting the invoice from the system and re uploading and going through the same sequence but it still does not appear.

Thanks in advance for any help

James