I'm afraid i can't answer that one!
It seems to happen sometimes, it should fix its self after awhile.
You'll also see different ads if you visit without the www.
Out of interest, how long did it take you to knock that site up? What do you think of the software?
I purchased a site using that script, and have experimented with a site, but never got round to finishing it., but the cms (although limited) seems easy and quick to use.