/lang/en_utf8/help/enrol/authorize/uploadcsv.html needs closing tag </li> as below.

[before]
<li>Finally, upload this CSV file to Moodle to enrol the users making payment by echeck.
</ol>
</p>

[after]
<li>Finally, upload this CSV file to Moodle to enrol the users making payment by echeck.</li>
</ol>
</p>