Cloudflare using non-standard IPs for pulling origin resources

Hi
I have a list of Cloudflare IPs that I got from https://api.cloudflare.com/client/v4/ips
However my apache logs lists at least ONE IP address that does NOT belong to this list but is obviously a cloudflare IP trying to pull static resources from the origin server. The IP that showed up was 172.70.231.84.
My apache set up is such that all IPs other than that received from https://api.cloudflare.com/client/v4/ips are redirected. I want to know if the list provided by cloudflare is exhaustive or not. Can someone pease help?

172.64.0.0/13 covers this IP address (172.64.0.0 to 172.71.255.255).

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