This may be happening because your acknowledgement process acknowledges the patron on the transaction and the recognition recipient. If a patron receives recognition for their own transactions they will pull into the process twice. Follow the steps below to remove recognition recipients from your acknowledgement process.
  1. Click Marketing and Communications > Acknowledgements
  2. Click edit next to processing options
  3. Unmark include recognition recipients
  4. Click Save
This issue could also occur if you don't filter your acknowledgement selection on transactions with an application of sales order.