wrong site displayed--seemingly randomly

[Chris Cortese]

I moved my sites over to a new server and a new install of nginx-0.7.40 
a couple days ago.  I noticed once 2 days ago that I went to one domain 
and one of my other sites showed up.  I thought this must be something 
strange with the DNS propagation.

Today my business partner went to our site and saw this same other site 
instead.  The site that sometimes is mistakenly showing up is the first 
site I migrated to the new server setup.

None of these sites is set to be any sort of default, and all are 
included an:
include ...../sites-available/*.conf;

Anybody have any idea what else could be causing this?  It's a pretty 
serious problem.


Thanks,
Chris