Source IP is different

[Runan_Chaung]

R80.20 

Open Server HP Gen 10

I have a question about connections in session.
The source IP of the session is 172.17.103.12. But there is a different  IP 172.17.7.78 .(many connections' source)
Is it a normal behavior?  (Source User Name is the same)

If so , how could I identity what device real access website/application in view/report?

(generate report by session only)
I konw that I can track log to find the device, but I want to find a way to identity real device convenience.