According to their documentation, DAP is built on-top of Google Analytics, and also IP Anonymization is enabled by default. As a Google Analytics power-user, I happen to know two relevants facts: 1) Geography is inferred from IP Address 2) IP Anonymization happens before geo look-ups.

So, what's probably happening is that some IP address in Graceville happens to end in the octect 0. And a bunch of other high-volume addresses, when you drop their last octect because of IP Anonymization, look like the IP address from Graceville.

As a more general note, the accuracy of geography reports in GA are suspect to begin with (Amazon and Google only agree at the state level about 75% of the time), and with IP Anonymization enabled it takes a substantial nosedive.