www.kaisinli.com is the default domain which means that everything else will redirect to it. That’s typically what you’d want, and it’s the most “stable” config in Webflow hosted sites - but it won’t work if you’re trying to make two different domains work and appear separately in the URL.
I think you might be confused though, you can’t have different domains show different content in your Webflow site. You can have multiple domains but they’ll all show exactly the same website.