The “unpaid commission” will only count/add commission for orders that were placed and set to the status “completed” after you installed/setup the Coupon Affiliates PRO plugin.
You can choose the required status for “unpaid commission” to be earned in the payouts settings, however this should be the final status for your orders once they are complete.

So if any orders were created and completed before you installed the PRO version of Coupon Affiliates, the “unpaid commission” will not have updated for these orders.
Grant “Unpaid Commission” for past “Completed” orders that were not granted
If you have any past “Completed” orders that did not update and grant the “unpaid commission”, you can manually trigger this for those by editing the order, and click the “Update” link next to the commission amount:

Bulk grant “Unpaid Commission” for past orders that were not granted
You can also grant unpaid commission for past orders that have not granted it yet, by going to the “Affiliate Orders” admin page, then in the bulk actions dropdown you can select “Update Unpaid Commission”. Once selected you can then bulk select any past orders that are completed but have still not granted the unpaid commission.

Edit Unpaid Commission
You can edit the “unpaid commission” amount manually if needed. Simply edit the coupon in WooCommerce, then go to the “Coupon Affiliates & Commission” tab, then you can edit the “Unpaid Commission” amount there.

You can also use the “bulk edit coupons” tool to bulk edit commission for multiple affiliate coupons: https://couponaffiliates.com/docs/bulk-edit-coupon-settings/