geolocation – If the IP address’s GPS coordinates is far enough from me, could a hacker be on my line?

It doesn’t mean that at all. Geolocation of IP addresses is usually not precise.
This can happen for a variety of reasons, e.g. the last person that had that address was located near there. Or it could be that location is the one that your ISP used to register a particular block of IP addresses.

It’s nothing to worry about.