Netflow show private IP on WAN interface

RouterOS General
1

Hello,
I have 751U-2HnD with IP-Traffic Flow enabled (Interfaces = all)
I use ManageEngine NetFlow Analyzer 9 as target.
But, when i see report for “ether1-gateway” (WAN interface with public IP), i see not only public IP, but also the private IP.
Why?

2

up.

3

check with the latest version (6.33rc33) and NetFlow v9