Here was the deal: both Groo and FJRMGM used the *exact*, same GPS coordinates, but FJRMGM had the later entry into the XML file, so he "stepped on" Groo's balloon.
Yeah, the registration instructions kind of lead to that. We were asked to enter the lat & long given by that zip code site, so that's what I did instead of entering the lat & long for my home address. So, of course, everyone from the same zip code will be stepping on each other's balloons.
Not a big deal. We still get a sense of where people are coming from even if we don't get a clear sense of how many are coming from each zip code. It's good.
