If your revenues and expense are summing absolute values instead of netting out, there are 2 places to check

Typical Fixes: (Assuming you wish to display and enter CR balance accounts (aka Revenues) as positive values)

Once corrected your report should look similar to the screenshot below:
(Sub totals for Revenue (CR balance Groupings) will show as Positive Values Sub totals for Expense (DR balance groupings) will show as Negative Values)

2) If the Native Totals were already check marked in Define Row Formats, then the Company Settings for Revenue formatting may need to be adjusted
