Unusual CNAME Problem

[Dettol]

I encountered a peculiar situation. (Domain Setup 's Force Redirect = No redirection)

My domain name is ABC.COM. Within DirectAdmin, I added a CNAME like ada.abc.com with the entry "ada 3600 CNAME abc.com." I also added the same CNAME record in CLOUDFLARE for the registered domain, with CNAME ada abc.com set to DNS only and Auto. However, after one hour, when I try to access ada.abc.com, the website automatically redirects to the server hostname instead of ABC.COM. I had to include "ServerAlias ada.abc.com abc.com" through Custom HTTPD Configurations to make this CNAME work properly. Any insights on this issue?

 

[Dettol]

Finally I find the problem:
This is a bug with the Cloudflare Proxy status button; it needs to be toggled on and off until it works properly.

I hope this will help someone like me