You likely recently received a new / different WAN (public) IP address assignment to your connection from their DHCP server / IP address pool, and the rDNS / geolocation data that is associated with it is now incorrect for you as it previously belonged to someone else that lived in that area. Comcast shuffles blocks of IP addresses around the country all the time. ISP's don't correct this. A third party service does. Unfortunately, this is typically a *back-burner* thing to get corrected. The only thing that you can do is to report it. You can try this;
Wait for the geolocation provider to approve your request. If your request is approved, the amount of time it takes to see the correction varies by provider. The average is a month or more.
If you have a router that has a MAC address cloning feature, you can clone a different MAC address in to it. This will force their DHCP server to assign a new / different public IP address to your connection.This is really the only sure way for an end user to do it but be advised that the new address may be from the same block and still suffer from the same incorrect geolocation data.