The value of the tracking sensor may change when I start the app in the same position/ orientation.

I'm developing an Oculus Rift S app.

Currently, I am having a problem.

When debugging, the value of the tracking sensor may be different even if I start the app with the goggles in the same position and orientation.

(Specifically, it changes by 0.2m in the z-axis and about 20 degrees in the yaw.)

(It occurs when the app is restarted several times without moving with goggles on.)

I think that the origin of the tracking sensor changes when setting the Guardian (setting floor height, play area).

In this case, even if the goggles are in the same position and orientation, the tracking sensor value will change before and after the Guardian setting.

However, the value of the tracking sensor may be different even though the Guardian setting has not been changed.

What could be the reason for this?