The lock screen and display manager are two separate pieces of software. The display manager runs before a user profile has been selected for graphical login, so it does not have access to your user desktop/display settings

There is also usually a load balancer in front of the actual application servers, so the page is probably being served by that instead

I always upvote people who always upvote people who always upvote people spreading the good word. Although, this is my first time doing it I think.