This is most likely caused by a loose ignition wire. When the ignition wire becomes loose it will no longer be able to tell when a vehicles ignition is on. This will cause the appearance of a vehicle always being stopped even when it has moved.
To fix this, reconnect the ignition wire securely so that the device will be able to sense ignition status again.
Another thing that could cause this appearance is that when installing the device the ignition wire was hooked up to the incorrect wire.
To fix this, connect the ignition wire to the correct wire, if you are unsure which wire is the ignition wire in your vehicle you can always search for this information.