Did you start writing a response in the thread itself? If I start a message, but dont finish it, what I had typed in before getting out of the thread to find some specific information, everything I had typed in before leaving the thread will still be present in the text box at the bottom of the thread. It could be due to the limited functionality of the unregistered burner phone I use to cruise BL, but its definitely worth checking there.
I just got out of this thread, clicked on two different threads away from this one, came back and found everything I had already typed without posting it was still there.
I hope this helps!