New post appears after the old one on front page

HI,
I have just put up a new post today but it appears after the old post that was put up yesterday.

Here is my site: baconandjackrussells.com

Here is my new post:
https://baconandjackrussells.com/2013/08/01/rome-where-it-was-so-hot-my-hair-curled/

Here is my old one from yesterday:https://baconandjackrussells.com/2013/08/01/simple-things-make-me-happy/

How come the new one would appear after the one one?

Thank you for your help. I have installed 3.6 already today as well in case you need that information. I am using origin theme.

Thank you
Michelle