NETCONF plugin creates multiple connections to devices

I'm seeing a behaviour where the NETCONF client connects twice to the same router.

So with a 16-node setup I see dual connections to some of the nodes if I do a "netconf -an | grep 830" (the number of extra connections is variable - in the case below you can see dual connections to 10.25.2.23 and 10.25.2.30):

tcp6 0 0 10.25.2.9:33593 10.25.2.30:830 ESTABLISHED
tcp6 0 0 10.25.2.9:51285 10.25.2.22:830 ESTABLISHED
tcp6 0 0 10.25.2.9:54615 10.25.2.18:830 ESTABLISHED
tcp6 0 0 10.25.2.9:43817 10.25.2.21:830 ESTABLISHED
tcp6 0 0 10.25.2.9:37689 10.25.2.23:830 ESTABLISHED
tcp6 0 0 10.25.2.9:42685 10.25.2.28:830 ESTABLISHED
tcp6 0 0 10.25.2.9:47717 10.25.2.24:830 ESTABLISHED
tcp6 0 0 10.25.2.9:54506 10.25.2.20:830 ESTABLISHED
tcp6 0 0 10.25.2.9:35595 10.25.2.19:830 ESTABLISHED
tcp6 0 0 10.25.2.9:54305 10.25.2.31:830 ESTABLISHED
tcp6 0 0 10.25.2.9:60015 10.25.2.29:830 ESTABLISHED
tcp6 0 0 10.25.2.9:55941 10.25.2.16:830 ESTABLISHED
tcp6 0 0 10.25.2.9:45517 10.25.2.25:830 ESTABLISHED
tcp6 0 0 10.25.2.9:44284 10.25.2.27:830 ESTABLISHED
tcp6 0 0 10.25.2.9:35339 10.25.2.26:830 ESTABLISHED
tcp6 0 0 10.25.2.9:33591 10.25.2.30:830 ESTABLISHED
tcp6 0 0 10.25.2.9:37712 10.25.2.23:830 ESTABLISHED
tcp6 0 0 10.25.2.9:56833 10.25.2.17:830 ESTABLISHED

on some runs the node inventory is correct, on others the data is missing from one of the nodes.