You will notice your site may be tested from locations you’ve not selected. This is normal behavior if your site is detected as being down from one of your test locations the system will the confirm from three different test locations.
Depending on how many locations we have in the countries you’ve selected we may do a confirmation from a location abroad. The locations from different locations will now show up in your performance charts.
To avoid other locations being used you should ensure you have a greater amount of locations set to the number of confirmation servers you wish to use.
For example if you are using 2 confirmation servers, you should set at least three different locations as shown below: