I've asked some of the smf team members to see if they can help me fix it.
The issue arose when we switched to the new semantic template.
@nukinfuts
Themes/default/Display.template.php
FIND
', $txt['quick_reply_desc'], $context['is_locked'] ? '<p><strong>' . $txt['quick_reply_warning'] . '</strong></p>' : '', $context['oldTopicError'] ? '<p><strong>' . sprintf($txt['error_old_topic'], $modSettings['oldTopicDays']) . '</strong></p>' : '', '
REPLACE
', $context['is_locked'] ? '<p><strong>' . $txt['quick_reply_warning'] . '</strong></p>' : '', $context['oldTopicError'] ? '<p><strong>' . sprintf($txt['error_old_topic'], $modSettings['oldTopicDays']) . '</strong></p>' : '', '