@leokhan
Hi, thank you for your question!
I hope your day is going well and I'm sorry to read you are having issues to login in the operator panel after a fresh install.
All HelpDesk page load correctly?
It's strange you get redirected wrongly if you try to login as operator and umh I have no idea why this is happening. Are you sure to not have edited some configuration server file, .htaccess?
Have you also tried from a different browser, in incognito mode too?