bug on habre or useful functionality

Noticed for a long time, but empirically checked just now.

For the experience you need to log off from the habr and go to the first page, then switch to the next page below and log in. After logging in, you will notice that you are no longer on the second page, but on the third.

try, gentlemen!
')
so a bug or something I do not understand?

ps I also want to make a useful suggestion. Please make tags in the writing of the topic through the autosuggest, as in facebook in the mail.