When you have flows configured for several devices. The network interface selection shows network interfaces which don't belong to the selected node. Here an example for two servers:
- mirror, eth0 ifindex 2
- scummbar, wlp2s0 ifindex 3
The flow data seems to be correct, see attached 2 json flow docs from ElasticSearch. The interface selection in the Flow Deep Dive tool shows both interfaces when the mirror server is selected and the scummbar server is selected.