Andrew, you are still with us, excellent
I'm sure you'll have worked this out, but for the benefit of others.....
Both the top and bottom links serve useful purposes. The top one is useful on the first logon of the day, to see new posts, then the bottom one is for anyone wants to go back further, or on a later logon session.
If you log out and immediately log back in, the "top" linked list is "cleared", as there will have been little chance of a new post between logout and login. However, the bottom linked list is unaffected and will always show all recent posts for the last week or so.