Geoip problem

Hello

We have set the geoIp option (heoIp php) and installed the latest maxmind geolite database.

For some odd reason , about half of the countries are mark as “unknown” even though when i’m searching the ip in the geoip demo site
https://www.maxmind.com/en/geoip-demo

The Ip is found with all the correct data (for example ip 178.198.187.77 is shown as unknown but according to the demo site it is a Swiss ip)

What can cause such problem ?
Thanks