What does it mean when internal pages of authorized users are listed as landing pages?

Question

Google Analytics

I need to see which landing pages have the best impact on signups.
But I can’t figure out what it means when Google Analytics lists as landing pages pages that are already available for authorized users, such as: a private messages page, or a notification page, or a pre-configured filter page?
How I look at landing pages in GA. Behavior -> Site Content -> All Pages

Answer 1

Presumably, the user is not logged out and immediately climbs onto

private message page, or notification page, or preconfigured filter page

It happens that when typing the first letters of the site name, the browser incorrectly prompts, and the user presses enter without looking, without editing the url