How can I issue an invoice without the clients' net amount outstanding figure being used?

I am a one-man band and my accounts are not fully synchronised with my bank, which is causing problems when generating invoices. Instead of sending the correct amount + VAT, it's showing a net outstanding amount which is almost always wrong.

I can't see how to turn this 'feature' off. Can someone advise please?

I appreciate I need to get on top of things with Quickbooks, but is there a quick fix in the meantime so my clients receive an invoice for the actual amount due?

Many thanks