LXC TURNKEY-GITLAB 17.1.1

[gabbler97]

I installed the turnkey Gitlab 17.1.1 LXC template.
After the installation weird behaviour is happening.
I try to log in to GitLab with my root account and I get an HTTP 500 error.
After that, I decided to register a test account, and redirected me to:
http://$MY_HOST/users/sign_in#login-pane
Then I decided to log in here with my root account and it was working.
After that
http://$MY_HOST/users/sign_in
This also started to work.
I decided to install it again from scratch.
After a fresh install, I tried to log in from http://$MY_HOST/users/sign_in#login-pane
It did not work, so again I registered a test account and after the redirect to http://$MY_HOST/users/sign_in#login-pane I tried to log in with my root account.
I worked and also worked again from http://$MY_HOST/users/sign_in.
One more thing, it is a nice feature that Turnkey has a feature to have automated security package upgrades, but why is the template using the deprecated 15.10.0 Gitlab version? Is it maintained?
Sorry for being demeaning. Thank you very much in advance!