Login in two password

Hi All,

I am new in forum.
I have a wordpress site. I had changed the password in 27 Jan 2011.

Now the problem is – 2 different post old(before 27 Jan 2011)& new (Updated post) are showing in different time.

I can login in wp-admin in new post if the new post is showing & if the old post(before 27 Jan 2011) is showing I can login in old password.

Please help me.

Sorry for my bad english