URL will be modified

Changed the url from “Change site name” in “site settings”

It works for a few minutes, but after a while it reverts back to the url before it was changed.
Is this a specification?

@kazoo Welcome to the Netlify community. It sounds to be a local issue. What Netlify subdomain(s) are you using?

Thanks for the reply.
I’m sorry but I’m not very familiar with it…
The URL is “https://○○.netlify.app/”.

I’m just uploading and changing the name of the site, do I need to do any special settings?

If your Netlify subdomain really is “○○”, that might be part of the problem.