Check the settings. I no longer get alerts, but from recollection, you set the distance from a certain Post Code location. Alerts for this will be for newly created profiles with their Original Post Code meeting your criteria. If a new profile moves into your area, then it will not be classed as a new profile for your area, as it was created elsewhere, then the location in the profile changed to your area.
You could increase the distance from your location, but will catch everything under the sun.
