WP 2.1 – Posting Problem

I have no idea,
is this a bug or there is something wrong with the way I post a news.

I try to insert this code somewhere between my post:

<div class=”blablabla”><hr /></div>

And, when I saw the result with browser, my Tidy plugin give me a warning alert. There is something wrong with my tag, unneeded <p> tag without closing </p> tag.

<div class=”blablabla”><hr /><p></div>

And then, I try to fix my post which contain unneeded <p> tag. But, I found more weird result with my post that I’m going to edit (i’m using code tab – not visual).

the code become: <p class=”blablabla”><hr /></p>

now, that is not funny 😀

I’ve done enough test about this problem,
and I’m pretty sure that there is something wrong.
Sometimes it is ok, sometimes it isn’t.

Now, I don’t want to edit my post again – it show me the correct code now.