I pointed this out quite a long time ago already but it´s still there
If you write a reply and click on “+ Reply to thread” your message is gone.
If you click on the gray “reply” button, your message is gone.
If you click it again btw. the reply with quote mode starts up.
So if you´re note 100% careful and only click the “post quick reply” button after writing a reply your text is gone.
By now I got a paranoia anyways. My posts are often long, so I write them in notepad++ and copy paste them because I already nullified a few posts that way.
Not really a problem, but it´s very unconvinient, and it makes the forum feels like it´s buggy or beta.