What is the problem?
When I go to my Octopi at http://octopi/ I am not logged in but I see the whole main page but with no data. So I click logon in the upper right corner and enter credentials and hit login. Nothing happens. I just get back to the main page, still logged out and no data. If I then hit refresh I get to the separate login page (the one that takes up the whole web page). I enter my credentials and bam, I'm logged in and everything is fine!
What did you already try to solve it?
Cleared cookies and cache
Additional information about your setup
Octopi with Octoprint 1.3.10