In response to a support ticket submitted re Some real IP's not identified, Incapsula support wrote: "This is a third party feature, which we do no support."
We fixed this by using the Wordfence option "Use the X-Forwarded-For HTTP header. Only use if you have a front-end proxy or spoofing may result." in How does Wordfence get IPs.
although ninja firewall requires extra code to detect incapsula, I found this plugin works to help word fence security correctly identify visitors.
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