The member’s account got suspended/closed during the adjustment.
The transactions in question have already been credited outside of Inspector.

After clicking the blue banner to navigate to the Adjustment Center, you'll want to confirm if the transaction in question has been credited. This will determine how you action the task. 

If credited
Select Done on the appropriate transaction. After, the adjustment task will close on its own. 

If not credited
Issue the adjustment manually in CST, and then hit Done on the adjustment task.