Newbie Question: Why Does My IP Geolocation Tool Show Inaccurate Country Data Sometimes for Users?

As a newbie developer, I'm working on my 'What is My Country?' tool, and I'm encountering some puzzling issues.

Specifically, my IP geolocation feature occasionally returns incorrect country data for certain users, which is quite frustrating.

I will include a dummy error log below to illustrate the kind of output I'm seeing.

// Sample IP Geolocation Output
{
  "ip": "203.0.113.45",
  "expected_country": "United States",
  "returned_country": "Canada",
  "query_time_ms": 120
}
// Another example
{
  "ip": "198.51.100.22",
  "expected_country": "Germany",
  "returned_country": "France",
  "query_time_ms": 95
}

Could anyone suggest common reasons for such inaccuracies or offer troubleshooting steps for improving IP geolocation accuracy?

Thanks in advance!