Unfortunately, there is no option to remove any data from RedTrack once it's recorded.
But there are several workarounds to correct the statistics:
- You can always update the payout (it will update only one of the duplicated conversions but since you can add any number, you can correct the whole amount so it is correct). Go to Logs -> Conversions -> Add conversions -> add the click id and the payout amount.
- If you clone the Campaign, you will get clean data for this new Campaign with the same settings inside (remember to update the tracking link or the script).