On the nation ranking display for a given alliance, for example, on [url=http://www.cybernations.net/allNations_display_alliances.asp?Alliance=Jamahiriya]this page[/url], the pop-up menus on the sidebar are center-aligned, while they are left-aligned on other pages. This occurs in Opera 10.63 as well as Firefox 3.6.
A quick look at the source code reveals a possible cause: the linked page contains 92 <center> tags, but 93 closing </center> tags.
Nothing major, but I figured I'd pass it along.