.01c Descrepancy After Debit Note

I have a ‘Purchase Invoice’ which I have paid.

I was incorrectly charged Freight (I have this set up as a non-inventory item) and have been given credit for it on my account so I create a ‘Debit Note’

My paid Invoice now shows


But now my Summary shows a .01c Accounts Payable
summar

And when I “drill down” on that figure I get

“Drill down” on that figure gives me

“Drill down” on that and it shows

My question is where did that .01c come from and why. How do I get rid of it?
It does disappear from the Summary if I enter a Receipt against that invoice, but until then it still should not be there.
Using version 23.12.6.1214 on W10.