For me it's an IP from the US.
Three things i have in mind:
- your Flagfox or their Database is/was not up to date
- manipulated proxy settings (willingly or malicious)
- Cloudflare's IP database is outdated.
Cloudflare redirects you to the nearest caching server. If they think, that you are located in China, they will redirect you to a caching node in China.
It is possible that your IP Adress has been assigned to an asian provider in former times. So if Cloudflare's DB is outdated such things can happen too