Where do the new posts go?

This is bugging me.

I press the new posts button and get a long listing of new posts. I look through them, picking a few to open in a new tab, and when I get to the bottom of the list, there is a little message saying “Results 1 to 100 of 142” or some such numbers. Then I click on the triangle to move to page 2, and the message now says “Results 101 to 119 of 119”!!!

What happened to the other new posts? Page 2 should show me “Results 101 to 142 of 142” but the second page always has fewer posts than indicated on page 1. Sometimes the second page is blank, and the Results message says there are fewer than 100 new posts.

What on earth is going on?