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You can override the guess in the Settings in the section Home Location:
https://project-gc.com/User/Settings
Locations of geocachers are not 100% accurate. It's statistically calculated from geocaching patterns which works very well for countries, but might be a bit less accurate for regions. Geocachers that have moved will most likely be misplaced.
This is the information when you click the help icon next to the "Only people from" fields on Top Finders search.