Index: wp-includes/pluggable.php
===================================================================
--- wp-includes/pluggable.php	(revision 25591)
+++ wp-includes/pluggable.php	(working copy)
@@ -1766,10 +1766,10 @@
 	if ( $args['title'] || $args['title_left'] || $args['title_right'] )
 		$r .= "<thead>";
 	if ( $args['title'] )
-		$r .= "<tr class='diff-title'><th colspan='4'>$args[title]</th></tr>\n";
+		$r .= "<tr class='diff-title'><th colspan='3'>$args[title]</th></tr>\n";
 	if ( $args['title_left'] || $args['title_right'] ) {
 		$r .= "<tr class='diff-sub-title'>\n";
-		$r .= "\t<td></td><th>$args[title_left]</th>\n";
+		$r .= "\t<th>$args[title_left]</th>\n";
 		$r .= "\t<td></td><th>$args[title_right]</th>\n";
 		$r .= "</tr>\n";
 	}