Static camera but the tracking is shaky

Hi, community,

I am using Vuforia Object Scanner to track a JoyCon. The training process went more or less OK, point cloud and all, according to the data from this screenshot:

But the issues come when I test the model. Attached to this post is a video I have taken where the capturing device is completely still, yet the green tracking pivot seems to shake all the time without interacting with neither the object nor the camera. It does not matter if I am close or far from the object, or the orientation of the camera, the pivot will shake no matter what.

The capturing device is a OnePlus 5 running Vuforia Object Scanner 9.4.6.

Am I doing something wrong? Is the device the issue here or did I miss something?

Thank you very much in advance.