Existence of invoice equal and opposite to invoice created

1

I have detected the existence of an invoice equal and opposite to the one created. I do not know how it was created but definitely the user did not create the duplicate. The attached gives more detail. The duplicate when viewed appears normal but on the transaction listing, it appears as payment. Something is wrong but I can not figure it out.
Kindly help.

Capture1-the two equal and opposite invoices.
Capture1-the two equal and opposite invoices.1232×275 17.6 KB

Real invoice created
Real invoice created955×583 17.2 KB

Duplicate that was not created
Duplicate that was not created947×490 15 KB

2

Another instance of the issue.

Another instance of it
Another instance of it1239×435 35.5 KB

3

Looking at the history for that invoice may clarify what has happened and when.

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