Hello,
Thank you for your question. AVL ID 175 Auto geofence has two values:
0 - target left zone.
1 - target entered zone.
In your case if you set generate event "On Both", you get value 1, because vehicle is in geofence. To get the value 0, select generate event "On Exit" and move without ignition on, so that geofence would not deactivate.
Let me know if there is something else I can help you with.
Regards