Did you properly setup the maxmind database? Follow the steps at https://www.mailwizz.com/kb/enable-campaign-geolocation-tracking-for-opens/ and download and place the file in the required location.I've set up geo custom fields of country and city, and have populated them programatically.
These seems to be yours, when another subscriber will visit, their details will show up.But when I click through to a subscriber, they all (every single one has the same details) look like this: