Typecho popular articles and other sidebars add sorting numbers and output blank spaces

As in the title, the sidebars of Typecho popular articles and other columns add sorting numbers and output blank spaces.
The code is as follows:

<code><?php $i = 1; ?>
<?php while($post->next()): ?>
<li><span class="label label-<?php echo $i; ?>"><?php echo $i; ?></span>
<a href="<?php $post->permalink(); ?>"><?php $post->title(); ?></a></li>
<?php $i++; ?>
<?php endwhile; ?></code>

Local PHP7, Typecho is the latest version of Github.