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No GPS gray circle

When your device has no GPS signal it will show a gray circle to indicate this. The gray circle is not the size of the radius that you have set for this location, just an indication that it does not have GPS signal at this time. 
GPS technology has limitations, regardless of AngelSense, that we essentially try to make the best of using our analytics. GPS reception indoors is poor due to not having line of sight with satellites, along with GPS limitations in general. Once the device is able to gain GPS signal upon leaving the indoor location it will resume sending the GPS location.‚Äč
Official U.S. government information about the Global Positioning System (GPS) and related topics

Related Articles:

Indoor Locations
View Current Location
Location via text
Unknown Places
Notifications delay
Notification types
Handling False Notifications
Runner Mode Overview
Transits Overview
Timeline Overview
"Early Warning Mode" Overview
Indoor Location Feature