On https://hg.rhodecode.org/rhodecode/summary the shortlog shows the latest 10 commits on the initial page load. Clicking on page 2 will skip 10 revisions.
For example, right now the tip is r1325. The shortlog shows r1325-r1316 but clicking on page 2 shows r1305-r1286 (skipping r1315-1306).
Only by clicking on page 2 and then back on page 1 will the skipped revisions be shown.
The initial load shows 10 revisions but clicking on a page will change all pages to show 20.