I AM QUITE SORRY IF THIS IS A DUPLICATE. IF SO ONE PERSON POST THAT IT IS AND EVERYONE ELSE REFRAIN FROM POSTING. NO NEED FOR 5 POSTS. I LOVE CAPS LOCK AND CAPS LOCK IT LOVES ME.
Noticed this a few times and finally figured out. If you start writting a reply and someone at lets say 10:00 PM and someone starts one at 10:05PM and he posts his, your still writting and then post. He will show up as the last post even though you are. So my brilliant deduction is that the last post is not really the last person to post but the person who started to write their post at the latest time. Should fix this!
I've been noticing this too. I sometimes go to someone's page chatting with them to make a comment, and I see a person's comment was last written. I send mine, then I come back, and it shows that mine was written before hers/his...