is served from farther datacenter over IPv4, but close datacenter over IPv6

Hi, I have an issue where (the service) seems to be served from YVR over IPv4, but SEA over IPv6. I live in PDX, so obviously SEA is the preferable datacenter and has better latency. My ISP is CenturyLink.

IPv4 results:

IPv6 results:

There’s not much Cloudflare can do. Chances are the ISP set up static routes or has old routes for 1^4.