Anything posted before march last year was done on a different system and with different software. When we switched to an sql database the import of the old data didn't update every bit of info. So if you look at posts made before march last year you will only get a limited amount of info, but, at least you do keep the content of the thread and you can search for it.
With ref to the fact that if you pst immediately after you have already posted then the system just appends your post to the previous post. It just stops people who haven't figured out how to edit their own posts from adding multiple posts one after the other when they have a lot to say but keep pressing the submit button.