Hello @Fauxman24
Firstly - I’ve removed your PDF from your post as this is a public forum.
“Credits” is credit on account rather than credit notes - also known as prepayments elsewhere in the system. These are not taken off any outstanding balances so the outstanding balance will not take these payments into account.
In your case you only have one invoice, but if there are 10 invoices for example, which of these should we assume to take the balance from? This is something the user (you) should be in control of. Once it’s allocated to an invoice the outstanding balance will be adjusted.
Regarding the credits/prepayments themselves, my colleague explains about these in a bit more detail, here:
I hope this helps.