The duplicate location was likely created when your ID was migrated from smartthings to Samsung. It happens.
The televisions may not work in the older location. The advice from support is normally to move everything from the old location to the new location that was automatically created for the Samsung ID. That does not mean that you have to re-– pair your devices. You just have to move them in the IDE from one location to the other.
https://support.smartthings.com/hc/en-us/articles/115002084986-Locations-in-the-SmartThings-app
To move devices from one Location to another, you must move all devices from the initial Location to the new one, including the SmartThings Hub. The devices will continue to be connected to the SmartThings Hub. This may be useful if you decide to move your existing SmartThings Hub and devices to a Location that already has non-SmartThings devices connected to it, such as an appliance or a television.
Once the original location is empty, then you can follow the advice to change it to default equals false, and then delete it.
This particular variation of this problem only occurs if you have a Samsung television or appliance.
See The following (this is a clickable link)