diag_confbak.php - Multiple copies of the config history and settings on the page
It looks like a rewrite of the page was started but not finished. There is a new style settings box at the top followed by one line of a different style configuration list, followed by the old style page settings, followed by a complete list of the config history. The settings and config history list repeat 30x, which is how many history entries also exist.
From the second "Backup Count" on down repeats 30x.