Try the following to remediate the duplicate incidents:
1. If within acceptable risk, create a path filter within the channel filters to exclude the paths creating the duplicate incidents.
2. Within Application monitoring(either global or local) set the offending application as a cloud application, this will cause the files in the sync/transfer folder to be removed upon a block and stored in the 'my recovered files' location. This will, however, cause incidents generated by this application to be listed as cloud sync incidents within the DLP console instead of the prior incident type(varies)
3. If the incidents are very close together, but stop eventually, you can try increasing the UI.CONSECUTIVE_TRANSACTION_TIME.int. Increasing this setting makes consecutive transfers considered part of the same file activity, potentially eliminating duplicate.s