Looks like an old MessageIndex.template.php (pre-February).
The file should have:
', $topic['replies'], ' ', $txt['replies'], '<br />
', $topic['views'], ' ', $txt['views'];
(that anyway is bad for localization as far as I know, it should be an sprintf, but that's something for 1.1), while you probably have instead the old:
', $topic['replies'], ' ', $txt['replies'], '
<br />
', $topic['views'], ' ', $txt['views'];