This is due to the Analysis Code being setup incorrectly.
If you have access to Corrections module you can use this feature to reverse the original transaction.
Please view this article for how to do this: Reverse a transaction using Corrections
If you don't have access to Corrections then please do it manually as following:
Reverse the transaction exactly as posted, (ideally using an opposite transaction rather than the corrections module whilst the Analysis code is still incorrect.)
Note : Correcting the Analysis code before reversing the transaction will only compound the issue more by reversing the transaction with the new Analysis setup rather than what has already been posted.
Correct the Analysis Code
Post the transactions now to reflect correctly.
Note: It is important to note that by changing an Analysis Code once it has been used will only affect transactions posted from that point onwards, anything which has already been posted in the past will continue to use the Debit and Credit nominals as original setup, this is recorded in the detail lines for all transactions.