Sralo mě to

templates/macros/post-form.html

@@ -1,5 +1,5 @@
 {% macro post_form(board, reply, reply_to) %}
-<form id="post-form" method="post" enctype="multipart/form-data" action="/actions/create-post" data-visible="false">
+<form id="post-form" method="post" enctype="multipart/form-data" action="/actions/create-post" autocomplete="off" data-visible="false">
     <input name="board" type="hidden" value="{{ board.id }}">
     {% if reply %}
         <input name="thread" type="hidden" value="{{ reply_to }}">