When you click the target icon in WHERE field, a script runs to find the city name against your IP address. If that script could not find any city name against your IP address then it returns NULL.
We are using geoip-db.com that has locations database, which is based on IP addresses. Below is the calling URL that is triggered by click.
URL: https://geoip-db.com/json/geoip.php?jsonp=callback
Try the above URL to see your city name as shown below.
If your city name is not populated as shown in the above screenshot then we assume that there is no city name against your IP address in the GEO IP database. But if you do see the city name in as shown in the screenshot but it’s not showing on your website then you can contact our support.
To change the search bar title from auto-detecting your city name, see How to remove location (city) from the search title?