@Damien-Lynn 

Is your TP-Link account or the camera shared with anyone? If someone has control of the camera, when using the camera Home/Away mode feature within the app, the camera's detection settings are altered, such as the detection zone in your case. How to edit Home and Away Mode for Tapo Cameras on the Tapo app

The Home/Away mode settings are saved locally on the mobile device/app only. Setting changes will be automatically synchronized to the phones (Tapo app) that are logged into the same TP-Link account.

You may try to restart the camera, see if that helps. <Tapo App -- Camera Settings -> Reboot camera.>

Make sure device's firmware is updated. How to update the firmware of the Tapo devices on the Tapo App