It might be because you have enabled Cloudflare's CDN feature.
Cloudflare CDN only supports the following ports:
HTTP Ports: 80, 8080, 8880, 2052, 2082, 2086, 2095
HTTPS Ports: 443, 2053, 2083, 2087, 2096, 8443
For more details, please refer to the Cloudflare documentation:
https://developers.cloudflare.com/fundamentals/reference/network-ports/