File not cache in certain Cloudflare Data Center

I encountered a weird issue. 1 of the .css and .woff file never cache in AMS data center and hit error 522 where the cache-control show private. However, if I load my site from other Cloudflare data center, eg SIN/LHN/CDG, the same file show HIT.

I purged all cache in the dashboard, but problem still there.

colo: CDG
cache-control: max-age=691200
cf-cache-status: HIT
cf-ray: 676bbb4cffc8ee5c-CDG

colo: AMS
Status Code: 522
cache-control: private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0
cf-ray: 676bc4cbdaf84bfa-AMS

The issue is that Cloudflare cannot connect to your origin from that location.

A 522 error typically happens when Cloudflare requests to the origin (your webserver) get blocked. Review the suggestions in this Community Tip for troubleshooting ideas.

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