the html for a static page comes from a mix of theme templates and the page content;
http://codex.wordpress.org/Theme_Development
as both 'contact' and 'disclaimer' have the same problem, the error might be in page.php of your theme.
particular chek that all html tags are closed properly, and that there are no unmatched opening or closing tags.
in your case, the dropping sidebar is mainly caused by this line:
<div class="postwrap" style="width: 917px;">
where the added width style does not leave any room for the sidebar.
this:
<div id="sidebar" style="width: 8px;">
also does make no sense.
if you don't want a sidebar in static pages, remove the <?php get_sidebar(); ?> code from page.php.