deployment problem

I tried to deploy a simple web app I wrote in Django and ran into
problem with user authentication.

On production server, the following steps didn't work like expected
(on development server).

"log in using a test user account,
access a restricted page."

it shows login required error message,
the page is displayed properly only after a refresh.

On development server, there is (should be) no error message.

All unit-tests passed on development and production server.
What could be causing it? Let me know if you need other info.

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