I found out on your site, maybe others if they use this software, but the 'show more' spoiler box toggles the last hidden message and not the current on the reply/topic.

example:
Click to say Hi
Click to say Bye

Your JS code:

<script>function toggle(e){var t=document.getElementById("{block_id}");"block"==t.style.display?(t.style.display="none")} t.style.display="block")}</script>

try:

<script>function toggle_id(e){var t=document.getElementById("{block_id}");"block"==t.style.display?(t.style.display="none")} t.style.display="block")}</script>

this just seems to override other script codes.