Geo IP databases are updated regularly as ISP data becomes available. It's not uncommon to see variations between different geo databases.
For example, you may have a Google campaign set to only buy US traffic. However, Azoogle redirect's some small percentage of the traffic to international offers. There is obviously a different between the database Google uses and the database Azoogle uses to determine geographic location. In this case, it probably makes sense to contact your Azoogle AM and ask them to turn off your geo redirects for the offer.