Comprehensive and Detailed Explanation From Exact Extract:

Duplicate flows can occur if multiple interfaces export the same data or if NetFlow is configured on both ingress and egress interfaces. SolarWinds documentation recommends:

Enabling the “flow de-duplication” feature within NetFlow Traffic Analyzer to automatically filter duplicate data.

Ensuring NetFlow is enabled only on ingress interfaces (best practice), as enabling it on both directions can result in duplicate records.

Automatic addition of flow sources and enabling on sub-interfaces do not directly address duplication.