Missing username in profile dropdown in profile page

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User account used: test_user_1

When I log in to RentSense, here
http://django-tutorial-test-before-deploy2.eba-n75bixnu.us-west-2.elasticbeanstalk.com/

I see the profile dropdown in navbar says "Welcome, test_user_1" as expected

However, when i click the item "My profile" in that dropdown the message changes to "Welcome, "

this is because the first name and last name elements are empty in the profile.

If there is a value, then there is no consistency in what name is shown on the navbar. the home page (http://django-tutorial-test-before-deploy2.eba-n75bixnu.us-west-2.elasticbeanstalk.com/
) shows the username, while all other pages show first name

Expectation: navbar must be consistent in showing the same details everywhere