Time to untwist your knickers ladies! The reason you see a different 'last post' time stamp on the thread list when compared to the last post in the thread is because there is a poll in the threads you are fretting about.
If a thread has a poll attached then every time someone votes in the poll the thread 'last post' time is updated. If this didn't happen and no one actually made a new post to the thread with the poll then that thread would slip down the list until it wasn't on the first page as other threads were updated with new posts.
It's not rocket science and nothing is broken. Just one of the ways threads with polls stay 'active' if there is a lot of voting but no new posts.
That was only one of the problems, and we worked that out ages ago.
This thread has never had a poll attached to it, but the times are wrong, still are, yours is. In the topic review the post time of your post is correct, but NOT on the actual posted reply.
May I ask for threads with polls, would it not be better to just make any thread with a poll a ''sticky''?