Magento Backend Login Goes to Homepage

Our live site backend https://test.example.co.uk/123/ after logged in it goes to main website not backend admin.

We are cleared the cache in magento and also done full deployment. Still issue persist.

We are added the site host url locally in host file C:\Windows\System32\drivers\etc\hosts like 185.124.160.137 test.example.co.uk

Now site backend works fine. Is there any cache issue in cloudflare? How to fix this issue?

Looks the issue in Redirect URL Rules in Cloudflare account.

They changed the Home page URL rule like home page not end with site name.like that.