That depends very much on what you define as "weird" (you might just think these pages are ugly, and you would most probably be right), but it's quite possible that your browser isn't displaying them correctly, particularly if it's fairly old.
These pages are written using HTML 4.01 Strict and CSS 2.
If your browser causes these pages to look even more boring than they
normally do in other browsers, or causes incorrect fonts or colours to be
displayed, then your browser probably doesn't support CSS 2 correctly. This
applies to versions of Netscape prior to version 6, and probably to
pretty much any browser produced before 1998. Browsers that don't support CSS
at all (such as lynx, links or w3m) will display
the content of these pages just fine. (You'll only see the "Why does this page
look odd?" link at the bottom of the page if your browser doesn't support CSS2
properly, since it's set as display: none in the stylesheet.)
My recommended browsers on Unix-like systems are links, Mozilla and Konqueror. On MacOS and Windows machines, I'd recommend Mozilla. Note that Mozilla on Unix has got faster with each new release; if you're running an old (particularly pre-1.0) version, I'd strongly recommend that you upgrade if you can. Browsers which embed Mozilla's "Gecko" rendering engine (such as Galeon and Skipstone) will also produce good results.
Note explicitly that I don't recommend using Netscape 4 any more on anything, because it's broken in a number of ways. If you really must use Netscape 4, then turn off its stylesheet support, since it misrenders valid CSS (go to Edit, Preferences, Advanced, and untick "Enable stylesheets").
If you're worried just because this page looks different from when you last saw it, then don't worry---I do occasionally change the stylesheet.