I know, it seemed odd to me too. I would think--they have the straight number somewhere in the databases.
Let me think...there is a reason too that the straight column totals don't work...my brain is tired.
Oh, if you do a total refund the adjusted amount is zero. Non refunds are a null. The straight auto sum of the columns doesn't work. Because it doesn't pick up the amounts of the full refund.
Making a separate column with a formula for each line to subtract adjusted order total from order total doesn't work because the spreadsheet reads the null entries as a zero entry.
It's incredibly annoying actually. I went through and manually calculated and added up the refund amounts.
I have a guess that the "adjusted amount" is for the third party accounting software they endorse, but that is just a wild guess. The only reason I can think of to have the adjusted amounts the way it is set up and not straight "real" and useful amounts.