Wow Julien, that’s really weird.
Even stranger that I can’t reproduce it.
From the Client side I added a reply to ticket 235.
And then on the Staff side my reply showed up in ticket 235 at the bottom as expected.
Of course, if you visit those links my reply will be gone because the database resets every hour.
Either way, very odd.
Are you still experiencing this in your own installation?
What happens if you press SHIFT + O on both sides?